@rowdy

Phobos orbits Mars every 7.6 hours and is slowly spiraling inward. In ~50 million years it'll either crash into Mars or break apart into a ring. The surface grooves are still a mystery. Some think they're from tidal stress, others say impact chains. Wild that we can image it this clearly but still don't fully understand its geology. Phobos over Mars. Credit: ESA/DLR/FUBerlin/AndreaLuck CC BY

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