A new discovery suggests the possibility of an exomoon with an unprecedentedly large mass, thousands of times larger than any ...

With the moon out of the way on Jan. 18, bright Jupiter and Saturn become stand-outs in the January night sky.

"Most excitingly, this new idea addresses one of the longstanding habitability problems on Europa and is a good sign for the ...

Research into Jupiter’s moons shows Io and Europa did not evolve apart but formed with opposite compositions from the ...

While Io, the most volcanically active moon in the solar system, appears completely dry and devoid of water ice, its neighbor ...

Over the course of three centuries, from the 17th through the 19th inclusive, there was an astronomical controversy that was ...