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Revision as of 12:16, 17 January 2021
Welcome to the explain xkcd wiki!
We have an explanation for all 3267 xkcd comics, and only 45 (1%) are incomplete. Help us finish them!
Latest comic
| Tethys |
Title text: In order to carry the necessary crafting supplies, they built the ships at 12:1 scale. |
Explanation
| This is one of 45 incomplete explanations: This page was created recently AND NEEDS TO BE RECREATED AT A 1:12 SCALE. Don't remove this notice too soon. If you can fix this issue, edit the page! |
Tethys, the fifth moon of Saturn, has a diameter of 1,060 kilometers, almost exactly 1/12th that of Earth's, which is 12,742 km.
This comic presents a fantastical scenario in which artists who produce miniature scale models of existing structures decide to use Tethys to produce a 1:12 scale model of the Earth. This is a patently absurd undertaking: all the difficulties of terraforming, already a monstrously hard task, would be exacerbated by the need to precisely recreate Earth's features, as well as by some particularly unfavorable traits of the Saturnian system. Tethys's distance from the Sun is too great for Earth's surface conditions to be recreated without artificially increasing insolation, likely through the use of orbital solar mirrors. These would be especially difficult to erect around Saturn, with its many moons and ring system causing severe gravitational interference. In addition, it would be difficult to get the necessary rockets, as it would be unlikely that any space agency would be willing to aid this thoroughly ridiculous project.[citation needed]
However, there is some good news: Tethys' large native water stores eliminate the need to ship in more, and the nearby moon Titan's atmosphere could be harvested for nitrogen, which is necessary to recreate Earth's atmospheric composition. Being very far away from Earth also means that there is no risk of nesting - having the model include a miniature version of itself, which includes an even more miniature version of itself, which includes....
Interestingly enough, the description refers to it as model-builders final project. This implies that once the Earth is recreated, it will be such a grand project that it will be the final miniature model ever made, which is unlikely[citation needed].
The title text humorously says that the ships used in the construction effort are built "at a 12:1 scale," i.e., 12x larger than normal (however "normal" is defined).
Transcript
[An image of a planet, presumably Saturn, showing prominent rings as well as three distant moons (one to the apparent right of it, the other two at the left) and one close, large moon. In front of the large moon is a line of spaceships dwindling into the distance toward the moon, or perhaps toward an orbit around it. Each spaceship has prominent rocket nozzles aimed toward the viewer and away from the large moon, as well as what appears to be a pile of material on "top" of the spaceship, with tie-down ropes holding it in place.]
[Caption below the panel:]
After learning that Tethys is exactly 1/12th the size of Earth, the miniature art model builders launched a fleet of ships to begin their final, greatest project.
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