Juno arrived at Jupiter in 2016 and has made over 60 orbits of the giant planet, but for the past few years it has been edging closer and making fly-bys of the large Galilean moons. On Dec. 30 ...

Following the discovery of the Galilean moons in January 1610 by means of a ... in California – the largest telescope in the world at the time. The moon, discovered by Barnard, orbits Jupiter within ...

as its Galilean moons show off while they dance in their orbits around the gas giant. Tonight, Europa and Ganymede transit Jupiter together, as they have a few other times this month. However ...

Io, the innermost of Jupiter’s four Galilean moons, is the most volcanic world in the solar system, giving it a dynamic mix of yellows, reds, and browns. Hyperion is one of the strangest moons ...

But not all moons behave this way, and due to the complicated nature of some exoplanet orbits it’s now believed that many moons end up being flung from their homes and sent drifting into space.