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xkcd #2908: Moon Armor Index (imgs.xkcd.com)

submitted 6 months ago by [email protected] to c/[email protected]

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https://xkcd.com/2908

Alt text:

Astronomers are a little unsure of the applicability of this index, but NASA's Planetary Protection Officer is all in favor.

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[–] [email protected] 7 points 6 months ago (2 children)

Finally, Earth is Number One again (well Number Two if you count Pluto, that is)

[–] [email protected] 6 points 6 months ago

Pluto-charon shouldn't count since it is more akin to a binary planetary system than a planet-moon system. Charon and Pluto are so close in size that the system has a barycenter outside of Pluto. This means instead of Charon orbiting a point inside Pluto, Charon and Pluto orbit a point about 800 km above Pluto's surface.

[–] [email protected] 14 points 6 months ago

That was why we told pluto it couldn't be in the club anymore.