Editing 2765: Escape Speed/Tables

__TOC__

Here the long tables needed for the explanation of the interactive comic [[2765: Escape Speed]] could be moved.

=Table of planets=
{{incomplete|
'''This is a different attempt to list and explain all the planets and other objects that have gravity and can be landed upon and explored'''.

The description and explanations may be incomplete or incorrect. Please help improve them. Try to keep separate the ''description'' (i.e. how the planet looks and what general features it has) and ''explanation'' (i.e. what the name and look represent, what they refer to both in the real and fictional worlds and what xkcd comics may have been a source or an inspiration. Please describe the planets only, not the objects that can be found on them.
}}
{| class="wikitable sortable"
! Name<br/><code>code-name</code>
! Tiles (X, Y) 
! Directions 
! Description
! Explanation
|-
| '''Starting Planet'''<br/><code>tiny-world</code> 
|  (6024, -8976)
| To get here, click the "Home" button in the lower right corner of the comic. 
|
The planet is tiny, grassy, has a few trees and bushes and features several people. Initially the navigation is difficult because of low initial engine thrust and strong gravity of the Origin planet nearby affecting movement.
|
This is where the game starts. Pressing the "Home" button to go back to the starting planet shows the message, "Welcome back, pilot", which may be a reference to the greeting that plays when re-entering a Titan in the ''Titanfall'' video games. 

|- 
| '''Origin'''<br/><code>origin</code> 
| (3096, -5904)
| To get here, launch from Beret Guy saying "Wow!" on the Starting Planet. 
|
The planet is fairly big, has vegetation, and features many people, landscape objects, items and upgrades. It has a shaft through the center. The planet is hard to leave without any upgrades unless one uses the shaft to gain more momentum by thrusting while moving through the middle of it. Many of the landmarks of the surface mark the directions to different planets.
|
The planet has a sign saying 'Welcome to Origin! You can never leave™'. The name may also refer to the fact that the planet lies almost at the center of the game world, or that it is the starting point for exploration as it provides many navigational hints.

|-
| '''Hollow Planet'''<br/><code>hollow-shell</code>
| (-13952, 1848)
| To get here, launch from the St. Louis Arch on Origin.
|
The planet is just a shell with some gaps. On the outside, there are a few signs that mark the directions to different planets.
|

|-
| '''Round Planet'''<br/><code>orb</code>
| (-19154, -7288)
| To get here, launch from the tower with an orb on it on Origin or the sign on the Hollow Planet.
|
The planet is moderately small with no vegetation and some architecture such as Stonehenge and the Great Wall of China. It also features a few people and items.
|
|-
| '''Uzumaki'''<br/><code>uzumaki</code>
| (-3904, -26904)
| To get here, launch from Origin's spiral landmark, the sign on the Hollow Planet, or below the plane-towed banner on the Round Planet.
| The planet is a large spiral overgrown with grass and some other vegetation. It has very weak gravity.
| The shape of the planet is inspired by the {{w|manga}} {{w|Uzumaki}} by {{w|Junji Ito}}.
|-
| '''Guitar Ship'''<br/><code>guitar-ship</code>
| (-12000, -30000)
| To get there, launch from Uzumaki, a little to the left of the caffeine molecule item.
| The planet is shaped like a guitar seen in perspective looking from the bottom of the body, with a dome on the back side. Within the dome there's the Boston skyline.
| This is a reference to the cover art of the album {{w|Boston (album)|Boston}} by the like-named American {{w|Boston (band)|rock band}}. It's one of many references to {{w|Boston}} in the game.
|-
| '''Spacetime Soccer Field'''<br/><code>soccerfield</code>
| (6048, 4048)
| To get here, launch from Origin, from the pyramid with a soccer ball on top of it.
| 
This is a tiny planet with a smooth surface and a distorted soccer field marked around it. The goals and goal area lines are on the opposite sides of the planet (let's say, to the east and west), distorted into curved trapezoids. The touch lines (side lines) are sections of hyperbolas with the vertices closest to the planet at the north and south poles, extending symmetrically to some distance from the planet. There is no goal line; in this geometry it should be the extended axis. What seems to be penalty lines, but drawn incorrectly to join the side lines instead of going back to the goal line, are sections of an ellipse. The halfway line appears twice, joining the four ends of hyperbolic side lines. The center circle appears as two separate halves stemming from the two copies of the halfway line.
|
The space soccer field utilizes the concept from [[2705: Spacetime Soccer]], but inversed: in the original comic the center point of the field was located in a gravity well, causing the ball to be pulled away from the goals; here the goals are located close to the center of the planet, so the ball naturally tries to fall towards them, probably making the game more interesting.
|-
| '''Saturn'''<br/><code>saturn</code>
| (2600, 14000)
| To get here, launch from the pyramid with Saturn on it on Origin. If you see the Spacetime Soccer Field, you're too far left.
| The planet resembles Saturn with its rings, however it is translucent: a soccer ball can bee seen inside. One of the ball's white hexagons is surfacing in the north pole area.
| It is a reference to [[2513: Saturn Hexagon]]
|-
| '''Andal'''<br/><code>platform-planet</code>
| (12048, 14048)
| To get there launch from a monument on Origin, featuring a round shape with a small "T" on top.
| This is a small partly rocky and partly grassy planet with a strange T-shaped tower.
| A reference to ''{{w|Animorphs}}'' book series featuring fictional sapient species of [https://aliens.fandom.com/wiki/Andalite Andalites]. Two such (or similar) creatures can be found on the planet. In the original books, the planet the Andalites come from is unnamed.
|-
| '''Projection of Earth'''<br/><code>earth-map</code>
| (-15808, 22192)
| To get there by follow the sign on the hollow planet or launch from the Earth map monument on Origin.
| The planet is shaped like a huge distorted map of all land masses of Earth. The player's spaceship can fly where water would be, but it can't go over land. Some straights between islands are to narrow for the ship to pass, especially in the {{w|Southeast Asia}} area. Some {{w|mediterranean seas}} are also inaccessible.
| Probably a reference to [[977: Map Projections]] or, more generally, to the Randall's obsession about [[:Category:Maps|maps]].
|-
| '''Voyager 1'''<br/><code>voyager-1</code>
| (1606, -14282)
| To get here, launch from the "Receiving transmission" communication device near the spiral landmark on Origin.
| This is a recreation of the {{w|Voyager 1}} space probe.
|
|-
| '''Voyager 2'''<br/><code>voyager-2</code>
| (10682, -5172)
| To get here, launch from the "Receiving transmission" communication device near the spider landmark on Origin.
| This is a recreation of the {{w|Voyager 2}} space probe.
|
|-
| '''SafetySat'''<br/><code>safetysat</code>
| (17024, 1024)
| To get here, launch from the cell tower on Origin.
| A cube satellite with an absurd set of assorted objects on board.
| This is a reference to [[1992: SafetySat]].
|-
| '''Shuttle Skeleton'''<br/><code>space-shuttle</code>
| (-30200, 14576)
| To get here, launch from the Shuttle Skeleton landmark on Origin or in the northwestern direction from Alaska on the Projection of Earth.
| The planet looks like an outline of the space shuttle with a strange skeleton inside.
| This is a reference to [[2630: Shuttle Skeleton]].
|-
| '''Giant Spider'''<br/><code>spider</code>
| (26982, -8714)
| To get here, launch from the spider landmark on Origin.
| The object is a giant spider floating in space with eight people standing on top of his legs.
| [[:Category:Spiders|Spiders]] is a recurring theme on xkcd.
|-
| '''Diffraction Spikes Star'''<br/><code>diffraction</code>
| (-19944, 11240)
| To get here, launch from the back of the left "hand" of the Shuttle Skeleton or the north of Alaska.
| The object is a star with very long spikes.
| This is a reference to [[2762: Diffraction Spikes]].
|-
| '''Roche Lobe Earth'''<br/><code>earth-roche</code> ''and'' <code>normal-moon</code>
| (-9952, -3952)
| To get there, launch from the like-shaped statue on Origin.
| This is a small, distorted, drop-shaped Earth with oceans and continents of the northern hemisphere. There's the Moon close by. The distortion looks like if the Moon's tidal forces are pulling northern Atlantic Ocean really hard.
| 
|-
| '''Dark Matter Planet'''<br/><code>dark-matter</code>
| (-2892, 2640)
| To get here, launch from the goal on the half of the field with just one person on it on Spacetime Soccer Field.
| This is a small, irregular planet with a black center (normal planets have white centers) and an inscription "DARK MATTER" inside, repeated three times.
|
{{w|Dark matter}} is a hypothetical form of {{w|matter}} sought by {{w|Astrophysics|astrophycists}} as a possible cause of behavior of {{w|Galaxy|galaxies}}, which cannot be explained by the current theory of {{w|gravity}} and observations. The anomalies would be explained if there was extra {{w|mass}} in the galaxies, which is not observed, but is theorized as dark matter presence. The dark matter is named this way not because it has some dark color, but because it supposedly does not interact (or interacts very weakly) with {{w|electromagnetic field}}, therefore does not emit {{w|light}} and can't be seen.

This is also a reference to [[2186: Dark Matter]]
|-
| '''Jurassic Park Planet'''<br/><code>gravity-qwantz</code>
| (20000, 11000)
| To get here, launch from the dinosaur on Origin or from the Andalites on Andal.
| It's a big planet with weak gravity, a lot of grass, and many dinosaur figures, some repeating a few times.
|
This is a reference to the 1993 {{w|Jurassic Park (film)|''Jurassic Park''}} film and the related {{w|Jurassic Park|media franchise}}. It contains images of dinosaurs taken from the [https://www.qwantz.com/ Dinosaurs] web comic, which, similarly to xkcd, uses a random string of letters for its domain name: <code>quantz.com</code>. It also reflects Randal's avid interest in [[:Category:Dinosaurs|dinosaurs]]. This is an exact copy of the Dinosaur Planet from [[2712: Gravity]].
|-
| '''Comet 67P'''<br/><code>67p</code>
| (18048, -11152)
| To get here, launch from the duck next to the 'Caution: long vertical drop' sign on Origin.
| This is a small, potato-shaped body, modelled after the {{w|67P/Churyumov–Gerasimenko}} comet.
|
This is a reference to the 2004&ndash;2016 {{w|Rosetta (spacecraft)|Rosetta}} spacecraft mission, which was the first to place a lander ({{w|Philae (spacecraft)|Philae}}) on a comet core. The mission was also commemorated in [[1446: Landing]] and the spacecraft are mentioned in [[1402: Harpoons]] and [[1740: Rosetta]].
|-
| '''What If? Planet'''<br/><code>gravity-earth</code>
| (22000, 34000)
| To get here, launch from the two people explaining where Boston is on Origin, the left of Stonehenge on the Round Planet, or the left rim of the Guitar Ship.
| This is a huge, round planet with many bodies of water. The planet contains several scenes from ''[[what if? (blog)|what if?]]'' and [[2712: Gravity]]. Megan and Cueball are floating inside a small space in the center of the planet.
| This is an almost exact copy of the Earth planet from [[2712: Gravity]], however a few scenes and all text were removed.
|-
| '''Subway Planet'''<br/><code>subway-planet</code> ''and'' <code>black-hole-3</code>
| (-46000, -24000)
| To can get there take off from the "secret glade" item next to the the bush where someone says "Shhh" on Origin. 
|
This is a huge planet with a subway system connecting places named after U.S. cities, similar to the one from [[1196: Subways]]. In the area where Boston should be according to that system, there is a giant round hole with rugged sides consisting of a lot of broken planks. There's a black hole inside, off the center, in the Washington, D.C. area. There are many people and features both on the surface and within subway tunnels.
|
This is a key planet to solve the puzzle in the game, and contains several out of many in-game references to {{w|Boston}} (in many meanings of the name) and the {{w|Massachusetts Institute of Technology}}, which currently is located in {{w|Cambridge, Massachusetts}}, but was founded in 1861 in Boston.

Obviously, it's also a reference to [[1196: Subways]]
|-
| '''Boston Planet'''<br/><code>mbta</code>
| (-42000, 8000)
| To get here, launch from the back of the Shuttle Skeleton.
|
This is a big, perfectly round planet with a subway system. It is invisible until the player finds uncloaking device switch. Initially, all underground tunnels are blocked by huge round rocks with the letter "T" at the entrances and smaller round rocks down the tunnels. To unblock the tunnels, player needs to find subway tokens scattered in the universe; they appear only after the Boston planet is uncloaked. Subway stations on the surface and inside are marked with Boston district names.
|
This is the other key planet to the game puzzle. It is apparently the round part ripped off the Subway Planet, but drawn not to scale. The tunnels inside the planet roughly correspond to the Boston part of the scheme in [[1196: Subways]], but with few additions (e.g. Union Sq, Mattapan). The codename comes from the abbreviation of {{w|Massachusetts Bay Transportation Authority}}.
|-
| '''Crystal Sphere'''<br/>''from'' <code>ring-1</code> ''to'' <code>ring-36</code>
|
| To get here, launch from anywhere and keep avoiding planets until you hit it. 
|
Most planets and celestial objects are inside of a thick enormous ring called Crystal Sphere. Both the interior and exterior edges of the Sphere are almost smooth, but have a few dents. There's a wide navigable crack leading out of the Sphere, which sides are rugged and riddled with broken planks, similarily to the Boston hole in the Subwau Planet. The gravity increases significantly as the spaceship goes through the crack, it gradually feels the pull from the parts of the sphere it has left. It is not possible to leave the Sphere without the hyperdrive, however having collected all the engine upgrades inside the Sphere one can barely reach the outer surface, but moving along is very difficult. Above the crack, there is an arch made up of the repeating words "The End", which is reminiscent of the "Don't leave the play area" message in [[1608: Hoverboard]] that appeared when the player tried to get out of it.
|
The Crystal Sphere may be a reference to {{w|The Crystal Spheres}}, a short story by {{w|science fiction}} author {{w|David Brin}}, which suggests that each star with habitable planets in the universe is surrounded by a crystal sphere that can be broken only from the inside and is otherwise completely impenetrable.

It may also be a reference to {{w|celestial spheres}}, an early concept trying to explain apparent movement of planets and stars.
|-
| '''Star Destroyer'''<br/>''from'' <code>star-destroyer-a</code> ''to'' <code>star-destroyer-i</code>
| (18192, -130000)
| To get here, launch from the crack in the Crystal Sphere. 
|
This is a gigantic starship; it could have barely fit within the Crystal Sphere. It is located out of the Sphere, right up from the crack, but it can't be reached without the Hyperdrive. It has many corridors and chambers inside, and a lot of people, objects and other features both inside and outside of it. The gravity of the Sphere is still strong around here, but the starship has its own center of gravity; the "down" direction generally points towards the ventral part of the starship, but not quite, making orientation somewhat difficult as the surfaces supposed to be level seem to tilt to the left near the stern and to the right near the bow of the starship. Below it, down a stream of torpedoes fired from a turred, there's a much smaller starhip.
|
This is a reference to {{w|Star Destroyer}}s and the {{w|Tantive IV|CR90 Corellian corvette}}, spaceships from the fictional ''{{w|Star Wars}}'' universe.

The whole scene is copied from [[1608: Hoverboard]], with the only difference being that {{w|Darth Vader}}'s dialogue was changed from referencing {{w|Steven Universe}} to {{w|The Murderbot Diaries}}. 
|-
| '''Click and Drag Planet'''<br/><code>clickdrag-nw</code>, <code>clickdrag-ne</code>, <code>clickdrag-sw</code>, ''and'' <code>clickdrag-se</code>
| (-31808, 111808) 
| To get here, launch from the bow or stern of the Star Destroyer tangentially to the Crystal Sphere to orbit it and keep the stars in the background moving horizontally on the screen until you see a dot around the spaceship guiding you.
|
The planet is huge, larger than any other in the game world, but smaller than the Star Destroyer. It is located outside the Crystal Sphere roughly opposite the Star Destroyer. It is mostly round, with many landscape features and scenes partly copied from [[1110: Click and Drag]], but arrayed in a circular, instead of linear shape. What's missing in comparison to the Click and Drag comic, is a few of the scenes, some textual content like dialogues (leaving persons intact), the underground parts, upper parts of the very high objects, and objects high above the surface.
|
|}

=Tables and Lists of Objects=

==Collectables==

===Plain list of collectables===
This is a quick list for those who want to check if they found everything.

The ''You found...'' sections directly show the names that appear in the player's list of found items. Some upgrades are also items and appear on the list, in such cases the names are the '''bolded''' parts of messages.

* '''Starting Planet'''
** You found...
*** a rock with neat stripes
*** a cool bug
*** a pretty leaf 
** Messages
*** Wheeee!

* '''Origin'''
** You found...
*** a secret glade
*** a holographic Charizard business card
*** a 5G seagull
*** a DVD of The Core (2003)
*** a normal-looking leaf
*** a marsh wren
*** an orb wren
*** a single grain of salt
*** 11 squares packed into a larger square
*** a tumbleweed 
** Upgrades
*** Nice flying! (Your tanks recharge faster now.) 
** Messages 
*** You found a tiny meteorite!
*** Welcome to liminal space
*** The St. Louis arch is also known as the gateway to space.
*** Be careful; this roller coaster can be disorienting!
 
*'''Hollow Planet'''
** Upgrades 
*** You found a handful of the quantum foam that makes up the fabric of space! (Your tanks recharge much faster now.)
*** You found '''a sixth Lagrange point'''! (Your thrusters are more efficient now.)
*** You found '''a glass of heavy water''' (Your engine gets a little more powerful.)

* '''Star Destroyer'''
** You found...
*** an unread email (The message adds: "Better leave it unread.")
*** a glass slipper with a glass foot in it
*** a lymphocyte
*** a forged resume
*** a serif
*** a Bursa of Fabricius
*** a cluster of data points
*** a premium subscription to food (The message has: "food.net")
*** two goats and a new car
*** an out-of-control trolley
*** a helium-238 nucleus
*** the Death Star plans 
** Upgrades 
*** You found '''a perpetual motion fidget spinner'''! (Your tanks recharge a bit faster now.)
*** You found '''a vintage Juicero juicer'''! (Your thrusters are more efficient now.) 
** Messages 
*** Hmmm.

* '''Click and Drag Planet'''
** You found...
*** an ant the size of Rhode Island
*** a pin with 17 angels dancing on it 
** Upgrades 
*** The vehicle below gives you a boost (Your launch speed has increased.)
*** We should turn back (Your engine gets a bit more powerful.)
*** You found '''an expert at underwater ropes'''. (Your thrusters are more efficient now.)
*** You found '''a trisected angle'''! (Your launch speed has greatly increased.)

* '''Subway Planet'''
** You found...
*** a relativistic bowling ball
*** a Cybiko® wireless handheld computer for teens (2000)
*** a handful of quantum foam
*** a normal-sized apple 
***'''a brightly-lit billboard''' (Your thrusters are more efficient now.)

** Upgrades 
*** You get the feeling you're not in Kansas anymore (Your tanks recharge a bit faster now.)
*** There is no parking in the white zone (Your thrusters are more efficient now.)
*** The next stop is Interplanetary Terminal G (Your engine gets a little more powerful.)
*** You feel accomplished (Your engine gets a little more powerful.)
*** You found '''a hot dog''' (Your launch speed has increased.)
*** You found '''a bottle of Coke Absolute Zero!''' (Your thrusters are more efficient now.)
*** You found '''a beige electron'''! (Your engine gets a little more powerful.)
*** You found '''$30 in Yahoo'''! cash! (Your engine gets a little more powerful.)
*** You found '''a friendly cat'''! (Your engine gets a little more powerful.) 
** Messages
*** Transfer here for Mornington Crescent 
** Tokens 
*** MIT Cloaking Device deactivated! Boston detected. (Blue, red, green, and orange lines activated.)

* '''Boston Planet'''
** You found...
*** a strangely heavy subway token 
** Tokens 
*** Blue line deactivated!
*** Welcome to MIT! You acquired a hyperdrive!
* '''Projection of Earth'''
** You found...
*** the Heart of the Ocean (The message adds: "It was drifting around in space.")
*** a whale shark
*** some microbial life
*** some tin from the Pantai Remis mine
*** a sparkling gem
*** a piece of pumice (The message says: "You found a piece of pumice floating in space!")
** Upgrades
*** You found '''the Principality of Sealand'''! (Your engine gets a little more powerful.)
*** You found '''a Rhode Island the size of an ant'''! (Your engine gets a little more powerful.)
*** You found an icosahedral d10 (Your engine gets a little more powerful.) 
** Tokens
*** Red line deactivated!

* '''What If? Planet'''
** You found...
*** an eye in the sky
*** a stick
*** an asterisk (The message adds: "it doesn’t seem to refer to anything.")
*** a sterile neutrino
*** a secret leaf
*** a pair of squirrel goggles
*** a large hadron
*** a smooth green snake 
** Upgrades
*** You found '''a sunken treasure''' (Your thrusters are more efficient now.)
*** The Yellowstone Super What? (Your launch speed has increased.)
*** Nutritional Facts - Serving Size: 1 Cloud, Total Calories: 0 (Your engine gets a little more powerful.)
*** You captured the flag! You decide to leave it there, but it's yours. (Your engine gets a little more powerful.)
*** You found '''a steam calliope'''! (Your engine gets a little more powerful.)
*** You found '''a DNA base pair'''! (Your engine gets a little more powerful.)

* '''Uzumaki'''
** You found...
*** a golden radio tuned to 1.618 MHz
*** a scroll lock key
*** a primordial black hole
*** a cool pair of shoes with flames on the side
*** an ink cartridge
*** a podcast episode
*** a festive but somehow unnerving holiday card from Junji Ito
*** a friendly bee
*** a spiral-cut diamond
*** a burrito 
** Upgrades
*** You found '''a tree-filled grove and a nice spot for quiet contemplation''' (Your thrusters are significantly more efficient now.)
*** You found '''a single caffeine molecule'''! (Your tanks recharge a bit faster now.) 
** Messages 
*** Exit Only
*** You're going the wrong way!

* '''Round Planet'''
** You found...
*** a swatch pop-out wristwatch 
** Upgrades
*** You found '''a sensible cheese platter''' (Your tanks recharge a bit faster now)
*** ''[no message]'' (Your engine gets a little more powerful.)

* '''Jurassic Park Planet'''
** You found...
*** a tiny pteranodon
*** a baby hedgehog
*** a tattered knapsack containing about $194,00 in $20 bills 
** Upgrades
*** Today is a good day I think for space exploration (Your engine gets a little more powerful.)
*** But what if gravity doesn't actually exist? (Your tanks recharge a bit faster now.)

* '''Andal'''
** Upgrades
*** You found '''two Andalites, one canonical'''! (Your thrusters are more efficient now.)
*** What a nice place for a ship to sit! (Your tanks recharge a bit faster now.)
*** You found '''a friend''' (Your thrusters are more efficient now.)
*** You found '''baby shoes (and baby)'''! (Your engine gets a little more powerful.)

* '''Comet 67P'''
** Upgrades
*** Some people believe that when the Earth appears in the sky, it's a harbinger of doom. (Your tanks recharge a bit faster now.)
*** You found '''a broken smoke machine''' (Your engine gets a little more powerful.)
*** Anyone for Scrabble later? (Your engine gets a little more powerful.)
*** You found '''The Long Now Foundation's''' nickel paperweight containing an '''archive of every''' published '''Animorphs book'''! (Your launch speed has increased.)

* '''Guitar Ship'''
** You found...
*** a guitar pick 
** Tokens
*** Orange line deactivated!

* '''Saturn'''
** You found...
*** a really cool data point 
** Upgrades
*** You found '''a pair of platonic solids, not quite touching'''! (Your engine gets a little more powerful.)
*** You found '''a block of scandium'''! (Your engine gets a little more powerful.)

* '''Roche Lobe Earth'''
** You found...
*** a curious Humboldt squid
*** a bathyscaphe (The message says: "You found a bathyscaphe at the Marianas Trench!")
*** a wayward Roomba full of moondust 
** Tokens
*** Green line deactivated!

* '''Giant Spider'''
** You found...
*** a spider-silk scarf 
** Upgrades
*** You found '''a friendly jumping spider''' (Your engine gets a little more powerful.)

* '''Dark Matter Planet'''
** Upgrades
*** You found '''a delicate music box'''. (Your engine gets a little more powerful.)

* '''Shuttle Skeleton'''
** You found...
*** a piece of space shuttle food 
** Upgrades
*** A little upgrade works wonders on fuel efficiency (Your thrusters are more efficient now.)

* '''Diffraction Spikes Star'''
** You found...
*** a hydrogen ion
*** a piece of coronium (iron) (The message says; "You found a piece of coronium! Wait, no, iron.")

* '''SafetySat'''
** You found...
*** a first of its kind 
** Upgrades
*** ''[no message]'' (Your thrusters are more efficient now.)
*** The more refined oil had a dinner engagement (Your thrusters are more efficient now.)

* '''Spacetime Soccer Field'''
** Upgrades
*** GOOOOOOOOAAAAAAAAALLLLLLLLLLLLL!!! (Your thrusters are more efficient now.)
*** GOOOOOOOOAAAAAAAAALLLLLLLLLLLLL!!! (Your engine gets a little more powerful.)
*** You found '''the 3 million point line''' (Your thrusters are more efficient now.)
*** You found '''a sunspot'''! (Your launch speed has increased.)

* '''Voyager 1'''
** Upgrades
*** You found '''Voyager 1'''! Some of its great speed rubs off on you. (Your engine thrust has increased significantly.)

* '''Voyager 2'''
** Upgrades
*** You found '''Voyager 2'''! Some of its great speed rubs off on you. (Your engine thrust has increased significantly.)

* '''Crystal Sphere'''
** You found...
*** a necklace of element samples whose symbols spell out your name (The message adds: "(note: hopefully you are not named 'katherine' or 'Brandon')!")
*** the platinum cylinder formerly used to define the kilogram
** Upgrades
*** A significant boost to the engines for a curious pilot (Your engine thrust has increased significantly.)
*** You found '''the gold crown Archimedes stole'''! (Your engine thrust has increased significantly.)

* '''Crack in the Crystal Sphere'''
** Upgrades
*** There is a way out (Your launch speed has increased.)
** Messages
*** Right lane must turn right
*** Left lane must turn left

* '''Open Space Outside the Crystal Sphere''' 
** Upgrades
*** It is very lonely out here (Your tanks recharge much faster now.)
*** You found '''a needle in a haystack''' (Your engine gets a little more powerful.)
*** From here you can view the source of it all. (Your thrusters are more efficient now.)

===Sortable table of collectables===

{| class="wikitable sortable"
! rowspan="2"|Planet
! colspan="4"|Collectable items
|-
! You found...
! Upgrades
! Messages 
! Subway tokens
|-
| '''Starting Planet'''
| 
* a rock with neat stripes
* a cool bug
* a pretty leaf 
|  
| 
* Wheeee! 
| 
|-
| '''Origin'''
| 
* a secret glade
* a holographic Charizard business card
* a 5G seagull
* a DVD of The Core (2003)
* a normal-looking leaf
* a marsh wren
* an orb wren
* a single grain of salt
* 11 squares packed into a larger square
* a tumbleweed 
| 
* Nice flying! (Your tanks recharge faster now.) 
| 
* You found a tiny meteorite!
* Welcome to liminal space
* The St. Louis arch is also known as the gateway to space.
* Be careful; this roller coaster can be disorienting! 
| 
|-
| '''Hollow Planet'''
|
| 
* You found a handful of the quantum foam that makes up the fabric of space! (Your engine gets a little more powerful.)
* You found '''a sixth Lagrange point'''! (Your thrusters are more efficient now.)
* You found '''a glass of heavy water''' (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Star Destroyer'''
|
* an unread email
* a glass slipper with a glass foot in it
* a lymphocyte
* a forged resume
* a serif
* a Bursa of Fabricius
* a cluster of data points
* a premium subscription to food
* two goats and a new car
* an out-of-control trolley
* a helium-238 nucleus
* the Death Star plans 
| 
* You found '''a perpetual motion fidget spinner'''! (Your tanks recharge a bit faster now.)
* You found '''a vintage Juicero juicer'''! (Your thrusters are more efficient now.) 
| 
* Hmmm. 
| 
|-
| '''Click and Drag Planet'''
| 
* an ant the size of Rhode Island
* a pin with 17 angels dancing on it 
| 
* The vehicle below gives you a boost (Your launch speed has increased.)
* We should turn back (Your engine gets a bit more powerful.)
* You found '''an expert at underwater ropes'''. (Your thrusters are more efficient now.)
* You found '''a trisected angle'''! (Your launch speed has greatly increased.) 
|  
| 
|-
| '''Subway Planet'''
| 
* a relativistic bowling ball
* a Cybiko® wireless handheld computer for teens (2000)
* a handful of quantum foam
* a normal-sized apple 
| 
* You get the feeling you're not in Kansas anymore (Your tanks recharge a bit faster now.)
* There is no parking in the white zone (Your thrusters are more efficient now.)
* The next stop is Interplanetary Terminal G (Your engine gets a little more powerful.)
* You feel accomplished (Your engine gets a little more powerful.)
* You found '''a brightly-lit billboard''' (Your thrusters are more efficient now.)
* You found '''a hot dog''' (Your launch speed has increased.)
* You found '''a bottle of Coke Absolute Zero'''! (Your thrusters are more efficient now.)
* You found '''a beige electron'''! (Your engine gets a little more powerful.)
* You found '''$30 in Yahoo'''! cash! (Your engine gets a little more powerful.)
* You found '''a friendly cat'''! (Your engine gets a little more powerful.) 
| 
* Transfer here for Mornington Crescent 
| 
* MIT Cloaking Device deactivated! Boston detected. (Blue, red, green, and orange lines activated.)
|-
| '''Boston Planet'''
| 
* a strangely heavy subway token 
|  
|  
| 
* Blue line deactivated!
* Welcome to MIT! You acquired a hyperdrive!
|-
| '''Projection of Earth'''
| 
* the Heart of the Ocean
* a whale shark
* some microbial life
* some tin from the Pantai Remis mine
* a sparkling gem
* a piece of pumice 
| 
* You found '''the Principality of Sealand'''! (Your engine gets a little more powerful.)
* You found '''a Rhode Island the size of an ant'''! (Your engine gets a little more powerful.)
* You found an icosahedral d10 (Your engine gets a little more powerful.) 
|  
| 
* Red line deactivated!
|-
| '''What If? Planet'''
| 
* an eye in the sky
* a stick
* an asterisk
* a sterile neutrino
* a secret leaf
* a pair of squirrel goggles
* a large hadron
* a smooth green snake 
| 
* You found '''a sunken treasure''' (Your thrusters are more efficient now.)
* The Yellowstone Super What? (Your launch speed has increased.)
* Nutritional Facts - Serving Size: 1 Cloud, Total Calories: 0 (Your engine gets a little more powerful.)
* You captured the flag! You decide to leave it there, but it's yours. (Your engine gets a little more powerful.)
* You found '''a steam calliope'''! (Your engine gets a little more powerful.)
* You found '''a DNA base pair'''! (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Uzumaki'''
| 
* a golden radio tuned to 1.618 MHz
* a scroll lock key
* a primordial black hole
* a cool pair of shoes with flames on the side
* an ink cartridge
* a podcast episode
* a festive but somehow unnerving holiday card from Junji Ito
* a friendly bee
* a spiral-cut diamond
* a burrito 
| 
* You found '''a tree-filled grove and a nice spot for quiet contemplation''' (Your thrusters are significantly more efficient now.)
* You found '''a single caffeine molecule'''! (Your tanks recharge a bit faster now.) 
| 
* Exit Only
* You're going the wrong way!
| 
|-
| '''Round Planet'''
| 
* a swatch pop-out wristwatch 
| 
* You found '''a sensible cheese platter''' (Your tanks recharge a bit faster now)
* ''[no message]'' (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Jurassic Park Planet'''
| 
* a tiny pteranodon
* a baby hedgehog
* a tattered knapsack containing about $194,00 in $20 bills 
| 
* Today is a good day I think for space exploration (Your engine gets a little more powerful.)
* But what if gravity doesn't actually exist? (Your tanks recharge a bit faster now.) 
|  
| 
|-
| '''Andal'''
|
|
* You found '''two Andalites, one canonical'''! (Your thrusters are more efficient now.)
* What a nice place for a ship to sit! (Your tanks recharge a bit faster now.)
* You found '''a friend''' (Your thrusters are more efficient now.)
* You found '''baby shoes (and baby''')! (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Comet 67P'''
|
|
* Some people believe that when the Earth appears in the sky, it's a harbinger of doom. (Your tanks recharge a bit faster now.)
* You found '''a broken smoke machine''' (Your engine gets a little more powerful.)
* Anyone for Scrabble later? (Your engine gets a little more powerful.)
* You found '''The Long Now Foundation's''' nickel paperweight containing an '''archive of every''' published '''Animorphs book'''! (Your launch speed has increased.) 
|  
| 
|-
| '''Guitar Ship'''
| 
* a guitar pick 
|  
|  
| 
* Orange line deactivated!
|-
| '''Saturn'''
| 
* a really cool data point 
| 
* You found '''a pair of platonic solids, not quite touching'''! (Your engine gets a little more powerful.)
* You found '''a block of scandium'''! (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Roche Lobe Earth'''
| 
* a curious Humboldt squid
* a bathyscaphe
* a wayward Roomba full of moondust 
|  
|  
| 
* Green line deactivated!
|-
| '''Giant Spider'''
| 
* a spider-silk scarf 
| 
* You found '''a friendly jumping spider''' (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Dark Matter Planet'''
|  
| 
* You found '''a delicate music box'''. (Your engine gets a little more powerful.) 
|  
| 
|-
| '''Shuttle Skeleton'''
| 
* a piece of space shuttle food 
| 
* A little upgrade works wonders on fuel efficiency (Your thrusters are more efficient now.) 
|  
| 
|-
| '''Diffraction Spikes Star'''
| 
* a hydrogen ion
* a piece of coronium (iron) 
|  
|  
| 
|-
| '''SafetySat'''
| 
* a first of its kind 
| 
* ''[no message]'' (Your thrusters are more efficient now.)
* The more refined oil had a dinner engagement (Your thrusters are more efficient now.) 
|  
| 
|-
| '''Spacetime Soccer Field'''
|  
| 
* GOOOOOOOOAAAAAAAAALLLLLLLLLLLLL!!! (Your thrusters are more efficient now.)
* GOOOOOOOOAAAAAAAAALLLLLLLLLLLLL!!! (Your engine gets a little more powerful.)
* You found '''the 3 million point line''' (Your thrusters are more efficient now.)
* You found '''a sunspot'''! (Your launch speed has increased.) 
|  
| 
|-
| '''Voyager 1'''
|  
|
* You found '''Voyager 1'''! Some of its great speed rubs off on you. (Your engine thrust has increased significantly.) 
|  
| 
|-
| '''Voyager 2'''
|  
| 
* You found '''Voyager 2'''! Some of its great speed rubs off on you. (Your engine thrust has increased significantly.) 
|  
| 
|-
| '''Crystal Sphere'''
|
* a necklace of element samples whose symbols spell out your name
* the platinum cylinder formerly used to define the kilogram
|
* A significant boost to the engines for a curious pilot (Your engine thrust has increased significantly.)
* You found '''the gold crown Archimedes stole'''! (Your engine thrust has increased significantly.)
|
|
|-
| '''Crack in the Crystal Sphere'''
|
|
* There is a way out (Your launch speed has increased.)
|
* Right lane must turn right
* Left lane must turn left
|
|-
| '''Open Space Outside the Crystal Sphere''' 
|  
| 
* It is very lonely out here (Your tanks recharge much faster now.)
* You found '''a needle in a haystack''' (Your engine gets a little more powerful.)
* From here you can view the source of it all. (Your thrusters are more efficient now.) 
|  
|}

==All Objects with Explanations==

{| class="wikitable sortable"
! colspan="5"|Features and Items
|-
! Planet
! Type
! Location 
! Description / Message
! Explanation 
|-
| rowspan="5" valign="top"|'''Starting Planet'''
| Message
| Above starting position
| ''Wheeee!''
| Probably reflects the excitation of a new visitor to this XKCD comic, seeing a promising game.
|-
| Item
| Above ground left of the starting position
| a rock with neat stripes
|
|-
| Item
| In the grass right of the starting position
| a cool bug
| A reference to 'Cool Bug Epoch' from [[2240: Timeline of the Universe]]
|-
| Item
| Up a tree
| a pretty leaf 
|  
|-
| People
| On the opposite of the starting position
| Beret Guy pointing his arm up and exclaiming ''WOW!''
| This is a reference to the title text of [[1117: My Sky]], and it could also be a reference to [[502: Dark Flow]].

|- 
| rowspan="41" valign="top"| '''Origin'''
| Landscape
| Close to the Starting Planet
| A sign saying: ''Welcome to Origin! You can never leave™''
| The sign names the planet, and also indicates that it is not possible to leave it by just launching off the surface during early gameplay, when the player has not collected any upgrades. May be a reference to the song by The Eagles: "Hotel California".
|-
| Message
| Right of the welcome sign, above the rollercoaster
| ''Be careful; this roller coaster can be disorienting!''
| A hint for the hidden shaft going through the planet; one of the entries is right below here.
|-
| Landscape
| On the right side of the rollercoaster
| A sign saying: ''Caution: Long vertical drop''
| Another hint for the hidden shaft.
|-
| Landscape
| To the right of the rollercoaster
| A spider-shaped monument
| Marks the direction to the Giant Spider planet
|-
| Landscape
| To the right of the spider monument
| A radio telescope with its antenna pointed straight up. ''Receiving transmission''.
| Marks the direction to Voyager 2. The message is an additional hint as radio telescopes are often used to communicate with distant space probes, including receiving probes' measurements and other scientific data, like photos.
|-
| People
| Right next to the cell tower
|
Cueball and White Hat talking.
:'''Cueball''': I bet the voyager spacecraft could teach you a thing or two about speed. Of course, you'd have to catch up to them first...
|
Voyager spacecraft are {{w|List_of_vehicle_speed_records#Spacecraft|not among}} the speed record holding space probes as of 2023, however they are the first in history to reach Solar System's {{w|escape velocity}}. They have also executed two {{w|gravity assist}} maneuvers each, so they are good examples on how to increase speed in this way, presumably allowing them to "teach" another spacecraft how to increase speed. Cueball's metaphor goes on to having to meet (catch up with) someone in order to learn something from him. The Voyagers are currently the farthest man-made objects in space; however in the game world they are quite close to the Origin planet.

This is also a hint regarding the upgrades located near both Voyager spacecraft, which add more thrust to the player's ship than regular thrust upgrades.
|-
| Landscape
| To the right from the radio telescope located near the spider monument
| A cell tower with 5G antennas. On top of it a strange object is mounted.
|
The strange object is a downscaled image of cube satellite from [[1992: SafetySat]]. Normally nobody puts cube satellites on top of fixed towers.

This landmark shows the direction to the SafetySat "planet".
|-
| Item
| Next to the top of the cell tower
| a 5G seagull
| {{w|5G}} is a modern emerging standard for {{w|cellular networks}} promising really high download speeds and much higher network capacity (i.e. the number of active devices in an area). Probably a reference to [[1656: It Begins]]
|-
| Landscape
| To the right from the cell tower
| A tyrannosaurus
| Marks the direction to the Jurassic Park planet.
|-
| Landscape
| Right next to the tyrannosaurus
| A St. Louis Arch shaped hole in the ground
|
|-
| Landscape
| To the left of the three pyramids
| A monument shaped like a sphere with a "T" on top
| This is a miniature of the Andal planet and marks the direction to it.
|-
| Landscape
| The leftmost of three pyramids
| A pyramid with a soccer ball on top
| Marks the direction to the Spacetime Soccer Field.
|-
| People
| The middle pyramid
|
Ponytail sitting on top of a pyramid, Megan standing at the base of it.
:'''Ponytail''': If you want a better spaceship, you need to visit another planet.
:'''Megan''': But if I want to visit another planet, I need a better spaceship!
|
An in-game reference to the fact that the player's ship initially has too little thrust to launch right off the surface of the Origin planet and needs an upgrade to become a "better" spaceship able to visit other planets. On the other hand, all engine upgrades are located off Origin, creating the apparently unsolvable {{w|Chicken or the egg|chicken-and-egg problem}} &ndash; unless the player follows other hints and finds a way to escape Origin anyway.
|-
| Landscape
| The rightmost of three pyramids
| A pyramid with Saturn on top of it
| Marks the direction to Saturn.
|-
| People
| Next to the pyramid with Saturn on top
|
Cueball and White Hat talking.
:'''Cueball''': I can't believe the Air and Space Museum's new exhibit has a real black hole!
:'''White Hat''': Is that... safe?
:'''Cueball''': It's OK, they've got a protective case around it.
|
Normally, it would not be possible to have a real black hole as a museum exhibit.{{citation needed}} Also, there's a misunderstanding between White Hat and Cueball. White Hat asks if it is safe for the public to keep a black hole in a museum. Cueball thinks White Hat is concerned about safety of the black hole itself, and responds that it is protected from unscrupulous visitors by putting it in a special case.

This is an in-game hint regarding the Subway Planet and the black hole present in its tunnels. It's also a reference to the real-world {{w|Intrepid Sea, Air & Space Museum|''Intrepid'' Sea, Air & Space Museum}}.
|-
| Landscape
| To the right from the pyramids
| A monument shaped like Earth's land masses
| Marks the direction to the Projection of Earth.
|-
| People
| Right next to the Projection of Earth monument
|
:'''Hairy''': Even if you did find a crack in the crystal sphere, there's no way you'd be able to escape its gravitational pull. You'd need some kind of a hyperdrive for that.
| An in-game reference to the Crystal Sphere, the navigable crack through it and the hint regarding the hyperdrive.
|-
| Landscape
| On the left side of the St. Louis Arch
| A monument of a strange spaceship
| This is a reference to [[2630: Shuttle Skeleton]] and marks the direction to the Shuttle Skeleton planet.
|-
| Landscape
| Opposite the rollercoaster
| A large arch
| This is a reference to the {{w|Gateway Arch}} located in {{w|St. Louis}}, {{w|Missouri}}. Marks the other end of the shaft going through the planet core.
|-
| Message
| A sign next to St. Louis Arch's right leg
| ''The St. Louis arch is also known as the gateway to space.''
| The creator of the Arch, Finnish-American architect {{w|Eero Saarinen}}, reportedly said that the arch symbolizes "the gateway to the West" understood as the {{w|American frontier}} and the expansion of American colonies into the western parts of the continent.

In-game, the Arch marks one of the "gateways" into the larger space of the game, namely the exits of the inner shaft, which allows the player to leave Origin by performing the Oberth maneuver (see below for further explanation).
|-
| Upgrade
| High above the St. Louis Arch
| ''Nice flying! Your tanks recharge faster now.''
| Congratulations for getting your orbital mechanics right and skillfully executing Oberth maneuver (see below). 
|-
| People 
| Right next to the St. Louis Arch
|
Ponytail with a group of three kids looking like Hairy, Megan and Cueball.
:'''Ponytail''': The St. Louis Arch is also known as the gateway to space.
| Ponytail acting as a guide repeats (or reads) to the kids the slogan written on the sign next to the Arch. See above for the explanation of the slogan.
|-
| Landscape
| To the right of the St. Louis Arch
| A monument with a pear-shaped structure connected to a small sphere
| It's a miniature of the Roche Lobe Earth, marking a direction to it.
|-
| Landscape
| To the right of the St. Louis Arch
| A small structure and a tower with a strange-looking orb on top
| Marks the direction to the Round Planet.
|-
| Item
| Close to the top of the orb tower.
| an orb wren
| {{w|Wren}}s are a common family of birds. Their bodies are rather stocky with short wings, sometimes resembling an orb, especially when perched with ruffled feathers such as when enduring cold weather. There's no species actually called an "orb wren".
|-
| Item
| Hidden at the base of the orb tower.
| 11 squares packed into a larger square
| A reference to [[2740: Square Packing]].
|-
| People
| To the right of the orb tower
|
Hairbun and another person.
:'''Hairbun''': Boston? That's in North America, on the Subway planet. It's straight up from the secret glade, you can't miss it.
|
This is an in-game reference and a hint on how to find Boston and the Subway Planet
|-
| Item
| Hidden in a grassy area to the right of the orb tower
| a tumbleweed
| {{w|Tumbleweed}} is an above-ground part of some species of plants in a form of a round, dense bush, which detaches as the plant dries in the summer season and is pushed by winds, rolling along the landscape.
|-
| Item
| Over a grassy area to the right of the orb tower
| a marsh wren
| {{w|Marsh wren}} is a species of North American songbird.
|-
| People
| To the right from the grassy area
|
A quintet of hairy and bearded or moustached people playing and singing:
:It's more than a feeling
:More than a feeling
| This is a reference to the popular song ''{{w|More Than a Feeling}}'' by the {{w|Boston_(band)|Boston}} rock band. It is also an in-game reference and pun regarding multiple Bostons present.
|-
| Message
| Above ground to the right of the musical band
| ''You found a tiny meteorite!''
| {{w|Meteorite}}s are fragments of small celestial bodies that have fallen onto the surface of Earth, surviving a high-speed passage through the atmosphere. Some are really tiny, being a result of a fragmentation of a larger one caused by the forces exerted during atmospherical entry. This particular one has not quite reached the surface, and should be called a {{w|meteoroid}} or a {{w|Meteoroid#Meteors|meteor}} instead. 
|- 
| Item
| High above ground to the right of the musical band
| a single grain of salt
|
|-
| Landscape
| Between the grassy area and the forest left of the welcome sign
| A spiral-shaped monument
| Marks the direction to the spiral Uzumaki planet.
|-
| Landscape
| Between the grassy area and the forest left of the welcome sign
| A radio telescope with its antenna pointed straight up. ''Receiving transmission''.
| Marks the direction to the Voyager 1. See also the entry on Voyager 2 above.
|-
| People
| Next to the voyager 1 radio telescope.
|
Cueball and Megan.
:'''Megan''': It's like my astronomy teacher always said: "Shoot for the Moon -- even if you miss, you might make a crack in the crystal sphere that imprisons us all in this universe."
|
|-
| Item
| At the left edge of the forest to the left from the welcome sign
| a holographic Charizard business card
|
This is a reference to a particular {{w|Charizard|character}} from the {{w|Pokémon}} media franchise. {{w|Holography|Holographic}} {{w|business card}}s are a fairly novel form of business or personal presentation.
|-
| Item
| In the middle of the forest to the left from the welcome sign
| a secret glade
|
|-
| Item
| Up the widest tree in the forest to the left from the welcome sign
| a normal-looking leaf
|
|-
| Message
| In the exact middle of the planet
| ''Welcome to liminal space''
|
|-
| People
| In a chamber next to the planet's center
|
Megan with her hair floating around her head.
:'''Megan''': The Oberth effect states that firing thrusters deeper in a gravity well adds more kinetic energy.
|
The {{w|Oberth effect}} is a physical phenomenon and orbital maneuver when a spacecraft fires its thrusters as close to the perycenter (the point on the orbit closest to the center of the orbited body) as possible, being deeper in the "gravity well", to gain more kinetic energy than if the same impulse (amount of propellant used and therefore speed difference) has been applied away from the center, in effect using its propellant more effectively. The kinetic energy is what allows a spacecraft to leave the proximity of the orbited body. A special case of such a maneuver may be accelerating in a theoretical shaft going through the core of the body, which is the case simulated in the game. Applying the principle according to Megan's hint the player is able to "swing" the spaceship a few times along the shaft, accelerating close to the center and allowing the "energy" to regenerate while away, and leave Origin in spite off low initial thrust.

The fact that inside of a spherical body the gravity of the outer layers cancels out creates a local microgravity environment, causing Megan's hair to freely float around her head.
|-
| Item
| In a chamber next to the planet's center
| a DVD of The Core (2003)
| A {{w|DVD}} is a digital {{w|optical disc}} format used most commonly for distributing {{w|film}}s, in his case the 2003 American {{w|The Core|science fiction disaster film}}. As the title suggest, it is inconveniently located at the core of the Origin planet.

|- 
| rowspan="8" valign="top"| '''Hollow Planet'''
|People
| In the hollow center of the planet.
|
Ponytail and White Hat floating in microgravity. White Hat's hat has come off his head.
:'''White Hat''': It's weird how a hollow shell doesn't exert gravitational force on objects inside it.
:'''Ponytail''': Oh, so ''that's'' why we don't feel a pull from the crystal sphere.
|
White Hat experiences a practical application of an unintuitive, and since "weird" in his words, {{w||shell theorem}}, as applied to gravity: that inside a hollow, spherical shell the forces of the gravity exerted by the shell cancel out for every object inside, regardless of its position within. Ponytail gets an epiphany, that it also applies to the gigantic Crystal Sphere surrounding the most part of the world she is in.
|-
| Item + Upgrade
| Close to the center of the planet.
|
a sixth lagrange point

''Your thrusters are more efficient now.''
|
{{w|Lagrange point}}s are places relative to two heavy bodies orbiting one another, where a third, much lighter body will stay in equilibrium with the large two, orbiting the common center of gravity with the same period and keeping a constant distance from both. There are only five Lagrange points.

In theory, a small body located in the center of a hollowed-out massive body will stay put as well (see the previous explanation), creating the sixth Lagrange point; however a hollow massive body can't exist, it will collapse under its own gravity.
|-
| Landscape
| On the surface of the planet.
| A sign with upwards-pointing arrow saying: ''Round Planet''
| Marks the direction to the Round Planet.
|-
| Item + Upgrade
| Over the surface to the right of the ''Round Planet'' sign
|
a glass of heavy water

''Your engine gets a bit more powerful.''
|
{{w|Heavy water}} is a form of water that contains only {{w|deuterium}} (hydrogen-2) atoms in place of the much more common {{w|Hydrogen|hydrogen-1}} atoms. It is approximately 10% {{w|Density|denser}} than the regular water, hence its name. Heavy water is not normally poured into glasses as for drinking.
|-
| Landscape
| On the surface of the planet to the right of the ''Round Planet'' sign
| A sign with upwards-pointing arrow saying: ''EXIT''
| Marks the direction to the crack in the Crystal Sphere.
|-
| Landscape
| Next to the ''EXIT'' sign
| A sign with upwards-pointing arrow saying: ''Uzumaki''
| Marks the direction to Uzumaki
|-
| Landscape
| Across a gap in the surface to the right of the ''Uzumaki'' sign
| A sign with upwards-pointing arrow saying: ''Origin and Subway''
| Marks the direction to Origin and (not quite precisely) to the Subway Planet.
|-
| Landscape
| On the surface opposite the ''EXIT'' sign
| A sign with upwards-pointing arrow saying: ''Earth (compromise projection)''
| Marks the direction to Projection of Earth.

|-
| rowspan="10" valign="top" | '''Round Planet'''
| People
| On the middle part of the Great Wall
|
Cueball and Megan.
:'''Cueball''': The Great Wall of China is the only human-made structure you can see space from.
|
This is a pun on the commonly voiced misconception that the {{w|Great Wall of China}} is the only man-made object on Earth that can be seen from {{w|Outer space|space}} (or the Earth's orbit at least).
|-
| Item + Upgrade
| To the right of the Great Wall over a field of boulders
|
a sensible cheese platter

''Your tanks recharge a bit faster now.''
|
A cheese platter is a common dish served in restaurants as a starter or sometimes as a main dish, as well as a final course in a formal meal (following the sweet, or as an option instead of one<!-- I just want to say I hate that. What if I want my sweet dish, my cheeses and then the coffee? Sorry, just one sign of the world going to hell in a handcart... -->) composed of a selection of cheeses served on a large platter. However, often it may just be a random collection of what's available (e.g. a hard cheese, a soft cheese, a blue cheese of either hard or soft variety, possibly a small serving of butter; and a selection of crackers that are either far too many or far too few for the other products). A "sensible" plate, i.e. well-composed by a competent chef, might be considered rare.
|-
| Item
| Within Stonehenge
| a swatch pop-out wristwatch
|
|-
| People
| To the right of the Stonehenge
| Hairbun walking on absurdly high stilts
| People walking on stilts are a fairly common theme in xkcd. References include [[482: Height]], [[1608: Hoverboard]], [[1663: Garden]], [[2603: Childhood Toys]], [[2669: Things You Should Not Do]] and possibly other comics (maybe we need a new category).
|-
| Landscape
| Next to Hairbun on stilts
|
Three spaceships flying just above the surface. The leading one transmits a message:
:''Rogue group, use your harpoons and tow cables! Go for the legs!''
|
This is a quote from ''{{w|Star Wars}}'' episode V ''{{w|The Empire Strikes Back}}''. In the original context the starships were attacking {{w|Walker (Star Wars)#All Terrain Armored Transport (AT-AT)|AT-AT}} four-legged armored vehicles, trying to immobilize them by entangling their legs. In the game, they are attacking Hairbun on stilts instead.
|-
| Upgrade
| Above the middle spaceship attacking Hairbun
| ''Your engine gets a bit more powerful.''
| A regular engine upgrade. 
|-
| People
| To the right of the three spaceships
| A volleyball net. Cueball is jumping in the air to hit a volleyball on the right side of the net while Ponytail is juggling three bowling pins on the left side.
|
|-
| Landscape
| To the right of the volleyball field
|
An airplane towing a long, narrow banner with a message printed across, not along it:
:''Does any one know how to get this thing to print in land scape mode?''
| A reference to [[2757: Towed Message]].
|-
| People
| To the right of the airplane towing a banner
| Beret Guy climbing a cell tower with some fruit hanging off the antennas. Cueball is standing next to it.
|
|-
| Landscape
| To the right of the cell tower
| Huge gallows with a large flag on a pole hanging on it. The pole of the flag is twisted into a shape partly resembling an infinity sign; the loose end of the pole pierces the flag. A relatively large Cueball figure stands next to it.
|

|-
| rowspan="16" valign="top" | '''Uzumaki'''
| Item + Upgrade
| On the outside of the spiral
| a single caffeine molecule
''Your tanks recharge a bit faster now.''
|
{{w|Caffeine}} is a chemical substance present in many plants including {{w|coffee bean}}s. Beverages containing it have a refreshing effect on people, reducing fatigue and increasing performance. It may be pun implying that after collecting this item, the spaceship is similarly "recharged" as a person after a cup of {{w|coffee}}, however a single {{w|molecule}} would not make a big difference.
|-
| Message
| The entrance to the spiral 
| ''Exit Only''
| In real world doors or gates are sometimes marked ''Exit Only'' to facilitate optimal movement of people or vehicles in an area or within a building, especially in an emergency. However, for such one-way passage to be useful, the structure must have some other entry points. The spiral has only one entry point.
|-
| Item
| Within the spiral 
| a festive but somehow unnerving holiday card from Junji Ito
| {{w|Junji Ito}} is the author of {{w|Uzumaki}}, which inspired the spiral planet. He specializes in {{w|Japanese horror}} genre, therefore a postcard with his original artwork on it might be perceived as "unnerving".
|-
| Item
| Further within the spiral 
| a podcast episode
| A {{w|podcast}} is a primarily a {{w|digital audio}} (now more commonly also a {{w|video}}) show or presentation similar to a {{w|radio program}}, but instead of being {{w|Broadcasting|broadcast}} at a predetermined time, is made available for {{w|download}} and later review at leisure. Being digital data, a podcast is intangible, therefore finding a podcast episode just lying around is a bit absurd missing some recording medium. On the other hand a digital video found on the Origin planet is recorded on a DVD (see above).
|-
| Item
| Further within the spiral 
| a friendly bee
|
|-
| Item
| Further within the spiral 
| an ink cartridge
| An ink cartridge is a container filled with {{w|ink}}, packaged for direct use in a device that dispenses the ink for drawing, writing, printing etc. It may refer to a cartridge for an old-fashioned {{w|fountain pen}} or an {{w|ink cartridge}} for a modern {{w|Inkjet printing|inkjet printer}}.
|-
| Landscape
| Further within the spiral 
|
A free-roaming Roomba

:'''Roomba''': WHIRRR
| {{w|Roomba}} is a line of {{w|robotic vacuum cleaner}}s popular in the {{w|hacker culture|hacker community}}. Roombas are a [[:Category:Roomba|common theme]] on xkcd, but this is likely a direct reference to [[1558: Vet]].
|-
| Message
| Just above Roomba
| ''You're going the wrong way!' ''
| Probably a reference to the ''Exit Only'' message above.
|-
| Item
| Further within the spiral 
| a spiral-cut diamond
| Raw {{w|diamond}}s are {{w|Diamond cut|cut}} to form {{w|Gemstone|gems}} used in {{w|jewellery}}. To expose the natural beauty of the mineral, the cut has to create symmetrical flat surfaces (facets) at specific angles to each other so {{w|White#White_light|white light}} {{w|refraction|refracts}} and {{w|Reflection (physics)|reflects}} within the finished gem, possibly multiple times, also {{w|Dispersion (optics)|dipersing}} on its way back to the viewer's eye, creating a brilliant look. Cutting a diamond in a spiral shape would be likely counter-productive and very difficult because of the material's {{w|brittleness}}.

It is a self-reference to the spiral "planet" the item is located on.
|-
| Item
| Further within the spiral 
| a golden radio tuned to 1.618 MHz
|
A {{w|Broadcasting|broadcast}} {{w|radio receiver}} (often called simply ''radio'') is an electronic device for receiving and listening to {{w|radio program|radio programming}} and has to be {{w|Tuner (radio)|tuned}} to a particular {{w|frequency}} to listen to the desired program. Frequency is measured in the unit of {{w|hertz}} or its {{w|Metric prefix|multiplies}}, in this example in megahertz. 1.618 MHz is located in the part of {{w|High frequency|HF}} (high frequency) range of the {{w|electromagnetic spectrum}} assigned (in the USA {{w|Frequency plan|band plan}}) to broadcasting, however not aligned to actual station assignments; the closest assignment is 1.620 MHz (1620 kHz) for {{w|WDHP}} station in {{w|Frederiksted, U.S. Virgin Islands}}. Due to inaccuracies involved with tuning and the 10 kHz {{w|channel spacing}} of American {{w|AM broadcasting|AM radio broadcasting}}, setting a real radio receiver to exactly 1618 kHz will allow listening to the mentioned station, as well as a few others which have nearby frequencies allocated, maybe with some distortion.

This is a pun referring to the {{w|golden ratio}}, being an {{w|irrational number}} of approximately 1.618 and to the {{w|golden spiral}}.
|-
| People
| Further within the spiral 
|
:'''Beret Guy''': I like spirals!
|
|-
| Item
| Further within the spiral 
| a burrito
| {{w|Burrito}} is a {{w|Mexican cuisine|Mexican}} and {{w|Tex-Mex}} cuisine dish consisting of various ingredients tightly wrapped in a {{w|flour tortilla|wheat tortilla}}. This is a rather nonsense joke; a possible connection to Uzumaki is that wrapping the tortilla creates a spiral cross section.
|-
| Item
| Further within the spiral 
| a cool pair of shoes with flames on the side
|
|-
| Item
| Further within the spiral 
| a scroll lock key
|
{{w|Scroll Lock}} is a key on {{w|IBM Personal Computer|IBM}}-compatible {{w|computer keyboard}}s, often accompanied with a status light. It was originally intended for changing the function of {{w|arrow keys}} between moving the {{w|Cursor (user interface)|cursor}} around the screen (Scroll Lock off) and {{w|scrolling}} the contents of the screen (Scroll Lock on). Later, different systems and applications repurposed the key for other functions, such as pausing and resuming automatic scrolling of copious textual output, or for other obscure purposes such as {{w|debugging}} or the ''{{w|Magic SysRq key}}'' on {{w|Linux}}. As such, the key has almost fallen out of use in modern computing, prompting manufacturers of small computers such as {{w|laptop}}s or small {{w|Form factor (design)|form factor}} keyboards to make it smaller, move it to a non-standard place in the {{w|keyboard layout}} or drop it altogether. Most laptops missing the Scroll Lock key on their keyboards implement some key combination which acts as if Scroll Lock was pressed, allowing advanced users to use the mentioned obscure functions anyway.

Placing this item quite deep in the spiral is a pun referring to difficulty in finding a Scroll Lock key or the equivalent combination on some modern computers. A few xkcd comics refer to the key: [[978: Citogenesis]], [[1465: xkcd Phone 2]], [[1854: Refresh Types]] and [[2206: Mavis Beacon]].
|-
| Item
| Further within the spiral 
| a primordial black hole
|
|-
| Item + Upgrade
| In the center of the spiral
| a tree-filled grove and a nice spot for quiet contemplation
''Your thrusters are significantly more efficient now.''
|

|-
| rowspan="2" valign="top" | '''Guitar Ship'''
| Item
| Just over the dome on the back of the guitar
| a guitar pick
| A {{w|guitar pick}} is a small flat tool for playing a {{w|guitar}}.
|-
| Token
| Close to guitar's neck
| ''Orange line deactivated!''
|

|-
| rowspan="4" valign="top" | '''Spacetime Soccer Field'''
| Upgrade
| Within one of the goals
| ''GOOOOOOOOAAAAAAAAALLLLLLLLLLLLL!!! Your thrusters are more efficient now.''
|
|-
| Upgrade
| Within the other goal
| ''GOOOOOOOOAAAAAAAAALLLLLLLLLLLLL!!! Your engine gets a bit more powerful.''
|
|-
| Item + Upgrade
| On the surface of the planet between goals
| a sunspot
''Your launch speed has increased.''
|-
| Item + Upgrade
| At the center spot on one of the soccer field
| the 3 million point line
''Your thrusters are more efficient now.''
|

|-
| rowspan="3" valign="top" | '''Saturn'''
| Item
| At the equator, below the rings
| a really cool data point
|
|-
| Item + Upgrade
| At the south pole
| a block of scandium
''Your engine gets a little more powerful.''
|
|-
| Item + Upgrade
| At middle latitudes of the northern hemisphere
| a pair of platonic solids, not quite touching
''Your engine gets a little more powerful.''
|

|-
| rowspan="6" valign="top" | '''Andal'''
| Upgrade
| At the top of the T-shaped tower
| ''What a nice place for a ship to sit! Your tanks recharge a bit faster now.''
|
|-
| Landscape
| To the right of the T-shaped tower
| Two fantasy animals: one looks like a centaur, the other as a horse-headed centaur.
|
|-
| Item + Upgrade
| Over the animals
| two Andalites, one canonical
''Your thrusters are more efficient now.''
|
|-
| Item + Upgrade
| In the grass close to some hills
| baby shoes (and baby)
''Your engine gets a little more powerful.''
|
|-
| People
| In the grassy area between two hilly regions
|
Cueball and Megan facing each other
:'''Megan''': The M.I.T. cloaking device only affects the electroweak and nuclear forces. Gravity is the odd one out, as usual.
|
|-
| Item + Upgrade
| Next to Megan
| a friend
''Your thrusters are more efficient now.''
|

|-
| rowspan="10" valign="top" | '''Projection of Earth'''
| Item + Upgrade
| The North Sea
| the Principality of Sealand
''Your engine gets a little more powerful.''
|
|-
| Item
| Northern Atlantic Ocean
| the Heart of the Ocean
| The whole message says: ''You found the Heart of the Ocean! It was drifting around in space.''
|-
| Item + Upgrade
| Next to Rhode Island
| a Rhode Island the size of an ant
''Your engine gets a little more powerful.''
|
|-
| Token
| Next to Boston, Massachusetts
| ''Red line deactivated!''
|
|-
| Item
| By the Alexander Island of Antarctica
| some microbial life
|
|-
| Item
| Off the West African coastline
| a whale shark
|
|-
| Item
| On the western coast of Myanmar near the Strait of Malacca
| some tin from the pantai remis mine
|
|-
| Item
| Next to the Celebes Island of Indonesia
| a sparkling gem
|
|-
| Item + Upgrade
| Off the southern Australian coast
| an icosahedral d10
''Your engine gets a little more powerful.''
|
|-
| Item
| Near the Kamchatka peninsula in Eastern Russia
| a piece of pumice
| The whole message says: ''You found a piece of pumice floating in space!''

|-
| valign="top" | '''Voyager 1'''
| Item + Upgrade
| Next to the dish antenna
| Voyager 1
''Some of its great speed rubs off on you. Your engine thrust has increased significantly.''
|

|-
| valign="top" | '''Voyager 2'''
| Item + Upgrade
| Next to the dish antenna
| Voyager 2
''Some of its great speed rubs off on you. Your engine thrust has increased significantly.''
|

|-
| rowspan="3" valign="top" | '''SafetySat'''
| Item
| In front of laser pointers
| a first of its kind
|
|-
| Upgrade
| Next to software-defined radio
| ''Your thrusters are more efficient now.''
|
|-
| Upgrade
| Next to crude oil tank
| ''The more refined oil had a dinner engagement. Your launch speed has increased.''
|

|-
| rowspan="2" valign="top" | '''Shuttle Skeleton'''
| Item
| At the tip of the ship's bow
| a piece of space shuttle food
|
|-
| Upgrade
| Next to the left-hand engine
| ''A little upgrade works wonders on fuel efficiency. Your thrusters are more efficient now.''
|

|-
| rowspan="2" valign="top" | '''Giant Spider'''
| Item
| Next to the tip of the spider's abdomen
| a spider-silk scarf
|
|-
| Item + Upgrade
| Next to the spider's mouth
| a friendly jumping spider
''Your engine gets a little more powerful.''
|

|-
| rowspan="2" valign="top" | '''Diffraction Spikes Star'''
| Item
| At the tip of a long spike
| a hydrogen ion
|
|-
| Item
| At the tip of a short spike
| a piece of coronium (iron)
| The whole message says: ''You found a piece of coronium! Wait, no, iron.''

|-
| rowspan="4" valign="top" | '''Roche Lobe Earth'''
| Item
| Off the California coastline
| a curious humboldt squid
|
|-
| Item
| Off the Japan coast
| a bathyscaphe
| The whole message says: ''You found a bathyscaphe at the Marianas Trench!''
|-
| Token
| Near Boston
| ''Green line deactivated!''
|
|-
| Item
| On the far side of the Moon
| a wayward Roomba full of moondust
|

|-
| valign="top" | '''Dark Matter Planet'''
| Item + Upgrade
| A little above the surface to the left of Ponytail
| a delicate music box
''Your engine is a little more powerful now.''
|

|-
| rowspan="6" valign="top" | '''Jurassic Park Planet'''
| People
| On the surface
| A person with a hat facing a couple
:'''dr John Hammond''': Welcome... to Jurassic Park.
|
|-
| Upgrade
| To the right of the people close to a dinosaur's mouth
| ''But what if gravity doesn't actually exist? Your tanks recharge a bit faster now.''
|
|-
| Upgrade
| Further to the right between two dinosaurs
| ''Today is a good day I think for space exploration. Your engine gets a little more powerful.''
|
|-
| Item
| Still further to the right
| a tiny pteranodon
|
|-
| Item
| Still further to the right, low above the grass
| a baby hedgehog
|
|-
| Item
| Below surface down from the middle of empty grassy area between two dinosaurs to the left of the people
| a tattered knapsack containing about $194,00 in $20 bills
|

|-
| rowspan="7" valign="top" | '''Comet 67P'''
| Landscape
| On the surface opposite the large bulge
| Remains of a crashed spacecraft
|
|-
| Item + Upgrade
| Just above the crashed spacecraft
| The Long Now Foundation's archive of every Animorphs book
''You found The Long Now Foundation's nickel paperweight containing an archive of every published Animorphs book! Your launch speed has increased.'
|
|-
| Landscape
| To the left of the bulge
| A small three-legged spacecraft.
:'''Spacecraft''': BEEP BOOP
|
|-
| Landscape
| On the bulge
| Cueball standing next to some apparatus
|
|-
| Item + Upgrade
| Next to the apparatus
| a broken smoke machine
''Your engine gets a little more powerful.''
|
|-
| Upgrade
| To the right of the bulge
| ''Some people believe that when the Earth appears in the sky, it's a harbinger of doom. Your tanks recharge a bit faster now.''
|
|-
| Upgrade
| Further to the right, next to a signpost
| ''Anyone for Scrabble later? Your engine gets a little more powerful.''
|

|-
| rowspan="21" valign="top" | '''Subway Planet'''
| Landscape
| Many places
| '''Warning! Air and Space Museum black hole ahead!<br/>Turn back while you still have enough engine thrust!''
|
|-
| Upgrade
| At a large opening in the planet's surface
| ''You get the feeling you're not in Kansas anymore. Your tanks recharge a bit faster now.''
|
|-
| People
| On the right side of the large opening in the planet
| Megan and Cueball standing on the edge. Cueball is leaning forward, looking down.
:'''Cueball''': Where's Boston?
:'''Megan''': I think M.I.T. kids took it.
|
|-
| Item + Upgrade
| In the entrance to a triple-wide tunnel leading down to NYC
| a hot dog
''Your launch speed has increased.''
|
|-
| People
| On the surface to the right of the tunnels leading to NYC
| Cueball and Danish walking.
:'''Cueball''': Why did those M.I.T. kids keep talking about Morgantown?
:'''Danish''': They're just transit enthusiasts, I guess.
:'''Cueball''': But Morgantown is tiny. It can't possibly have a subway, can it?
:'''Danish''': Not exactly...
|
|-
| People
| On the surface above Santo Domingo
| Hairy and White Hat.
:'''Hairy''': A lot of people don't realize that North America only has one subway system; each city's metro is just one part of the network.
|
|-
| Item + Upgrade
| At the entrance to a tunnel leading to Santo Domingo / Monterrey area
| a bottle of Coke Absolute Zero
''Your thrusters are more efficient now.''
|
|-
| People
| On the surface to the right of the Mexico City
|
:'''Ponytail''': Welcome to the Subway Planet, home of all North America's metro systems!
|
|-
| People
| Further to the right
| Ponytail and Cueball. Cueball is holding a four-wheeled suitcase.
:'''Ponytail''': Boston? No, that's on the other side of the planet. Or used to be, anyway.
|
|-
| People
| Further to the right
| Ponytail and Megan walking.
:'''Ponytail''': My favorite thing about visiting Origin is all the pointing sculptures. They make it so easy to navigate!
|
|-
| People
| On the surface next to San Francisco
| Cueball and Megan standing on the opposite sides of a tunnel entrance.
:'''Cueball''': If you're looking for someone to track down those M.I.T. kid, you could try asking CalTech.
:'''Megan''': But we're in San Francisco; Isn't CalTech in Pasadena?
:'''Cueball''': Yeah, it's down there somewhere.
|
|-
| People
| Between San Francisco and Vancouver
| Ponytail jumping across a tunnel entrance.
:'''Ponytail''': Vancouver!
|
|-
| People
| Vancouver
| Cueball and Ponytail looking up.
:'''Cueball''': Huh, I never noticed that crack in the crystal sphere before.
|
|-
| People
| Down in the tunnels in Montreal
|
:'''Knit Cap''': Bienvenue à Montréal!
|
|-
| People
| At the bottom of the large hole in the planet's surface
| Blondie and Megan.
:'''Blondie''': I hear M.I.T. kids were working on a cloaking device. Boston could be anywhere.
|
|-
| Item
| In a short dead-end tunnel near the right side of the hole
| a Cybiko® wireless handheld computer for teens (2000)
|
|-
| Item
| In a short dead-end tunnel down in NYC
| a handful of quantum foam
|
|-
| Item + Upgrade
| Down in the tunnels of New York City
| a brightly-lit billboard
''Your thrusters are more efficient now.''
|
|-
| Item
| Down in NYC
| a normal-sized apple
|
|-
| Item + Upgrade
| In the tunnel leading from New York City to Washington, D.C.
| a friendly cat
''Your engine gets a little more powerful.''
|
|-
|
| 
|
|

<!-- the next planet goes here -->
|-
| rowspan="2" valign="top" | 
|
|
|
|
|-
|
| 
|
|

|-
| ...
| ...
| ...
| ...
| ...
|}


{{DEFAULTSORT:2765}}
[[Category:Comic subpages]]