Editing 2903: Earth/Venus Venn Diagram

{{comic
| number    = 2903
| date      = March 6, 2024
| title     = Earth/Venus Venn Diagram
| image     = earth_venus_venn_diagram_2x.png
| imagesize = 416x309px
| noexpand  = true
| titletext = Actually, the fact that Mars is still orbiting safely over here means that it was technically an *Euler* apocalypse, not a Venn one.
}}

==Explanation==
A {{w|Venn diagram}} illustrates the relationships and differences among sets by showing common and distinct elements, using overlapping circles or variously shaped closed lines. This comic is both a '''Venn diagram''' and a '''proximity illustration''' of {{w|Earth}} and {{w|Venus}} colliding, physically 'overlapping' each other.
* As a '''proximity illustration''', it depicts Earth and Venus smashing into each other, resulting in "shockwaves and production of impact ejecta" occurring where they collide. The relative circle sizes are accurate; the circumference of Venus is 5% smaller than Earth's.
* As a '''Venn diagram''', it shows that there is an entity that is Earth, an entity that is Venus, and that their most relevant commonalities are "shockwaves and production of impact ejecta," strongly suggesting that Earth and Venus are colliding with each other.

In this illustration, the abstract commonalities of the two planets, as displayed in the Venn diagram, have a physical reason, as portrayed by the proximity illustration. The collision creates an intermingled Earth-Venus overlap, both logically and physically.

'''Shockwaves''' are intense, high-pressure waves caused by the immense force of the impact, that propagate through the materials of both planets faster than the speed of sound. 

'''Impact ejecta''' are the materials expelled from the impact site, consisting of molten rock, vaporized material, and solid debris, flung out at high velocities due to the energy released by the collision. The production of impact ejecta would indeed occur in the overlapping impact area.

The title text is [[2721: Euler Diagrams|another xkcd joke]] about the difference between a [[:Category:Venn diagrams|Venn]] diagram and an [[:Category:Euler diagrams|Euler]] diagram, which is similar to a Venn diagram except that it's acceptable to have circles (or other shapes) that do not intersect if there are no common elements between those sets. The observation that {{w|Mars}} is still orbiting by itself makes Mars an additional set (out of the frame of the diagram), in addition to - but not intersecting with - Earth and Venus, making this technically an {{w|Euler diagram}}. Therefore if the Earth-Venus collision is a "Venn apocalypse," the inclusion of Mars as a non-intersecting entity makes this technically an "Euler apocalypse."

As a thought experiment, if you expand the diagram infinitely, a "{{w|Big Crunch|Venn apocalypse}}" would consist of every body in the universe being in the process of colliding, simultaneously. This would be very dangerous.{{Citation needed}}

===Similar jokes===
This joke is similar to the 'Pie chart' meme, showing 'pie I have eaten' and 'pie I have not yet eaten' as a mathematically conventional pie chart formed by a photograph of the actual subject of the chart: a real-world partially-eaten pie.

==Transcript==
:[Two circles are drawn so they overlap. The segments of the circles that overlap are drawn in dashed lines. Each circle has a label and text are written in the central overlapping part the circle. Above the circles there is a caption:]
:Earth/Venus Venn Diagram
:Left: Earth 
:Right: Venus 
:Center: Shock-waves and production of impact ejecta

{{comic discussion}}

[[Category:Venn diagrams]]
[[Category:Astronomy]]
[[Category:Euler diagrams]]