Ganymede is incredible. The biggest moon on the solar system *bigger than Mercury*. Imagine what amazing things must be on its surface, which we haven't seen up close in toto.
@hourlycosmos.bsky.socialGanymede 1997-02-21 - From Aster Cowart (terrasabaea.bsky.social) - https://flic.kr/p/s9nXj7
