I had some unused space so I’ve set up an exhibit of Jupiter and the four Galilean moons. It can be reached from the ground via the Anywhere door here: http://maps.secondlife.com/secondlife/Babbage%20Square/202/115/111
Or to go directly: http://maps.secondlife.com/secondlife/Babbage%20Square/204/158/1209

The distances between the moons and Jupiter are not to scale (it would require half a sim), but the sizes and orbital speeds are as close as I can make them. The suggested viewing setting is Midnight.

Ahh Jupiter, home of small scale gas mining opperations.