The four Galilean satellites of Jupiter are not mere moons. They are worlds unto their own. Ganymede is larger than Mercury. Europa has an outside chance for life.
But there is another body that is just as remarkable. And unlike the others, It has an atmosphere…a bit heavier than ours. Mostly nitrogen, as is ours. It has wind and weather, maybe precipitation, small lakes and even small seas. There are mountains. Boulder-strewn deserts. Volcanos. The gravity is about one-third that of Mars.
There is the fact, though, that the temperature on even the most pleasant day is about 300º below zero. The rain and the small lakes/seas are ethane, methane and lots of other “thane”s you don’t want to know about. One-third the gravity of Mars is less than that of the moon. The volcanos spew liquid water that stirs the atmosphere. Other interesting stuff.
An interesting place, for that matter. Fascinating. But you wouldn’t want to plant your tomatoes there.