Ganymede is a Jovian moon that is larger than Mercury.
Luckily, that line of research is on the docket.
Well know a lot more in just seven short years.
An artist’s concept of the JUICE mission orbiting Ganymede, with Jupiter in background.Illustration: ESA (acknowledgement: ATG Medialab)
News from the future, delivered to your present.
As for the Moon, not so much.
Furrows (right) on Ganymede’s surface, which formed around a central spot (noted in red +, left). Image: HIRATA Naoyuki