Greboca  

xkcd.com  -  Earth-Like Exoplanet

 -  Septembre 2019 - 

Fire is actually a potential biosignature, since it means something is filling the atmosphere with an unstable gas like oxygen. If we find a planet covered in flames, it might be an indicator that it supports life. Or used to, anyway, before the fire.

par

xkcd.com

xkcd.com : A webcomic of romance and math humor.

Cursive Letters

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Greenland Size

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The Wreck of the Edmund Fitzgerald

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Moon Landing Mission Profiles

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Moon Armor Index

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