Europa was one of four moons discovered on Jan. 7, 1610, by astronomer Galileo Galilei. Speaking of Galileo, this photo was ...

On January 7, 1610, the Italian astronomer Galileo discovered three of Jupiter's moons: Callisto, Europa and Io. When he ...

Research and development is underway to create robots that can hunt for signs of life in the vast oceans that exist under the ...

Italian astronomer Galileo Galilei peered through his newly improved 20-power homemade telescope at the planet Jupiter. He ...

Mars has two moons, Phobos and Deimos. Scientists still debate whether these came from asteroids that passed close into Mars' ...

Nearly 415 years ago to the day astronomer Galileo Galilei discovered the moons surrounding Jupiter looking through his homemade telescope.

As many as 400 volcanoes are erupting on ... and how it changes as the volcanic moon is squeezed and stretched by Jupiter's (and its fellow moons') gravity. If Io did have a sub-surface ocean ...

While Jupiter is known for its four large Galilean ... breaking up at some point in Saturn's past. Saturn's major moons have many names from cultures around the world. Some include Aegir (Norse ...

In recent years, Saturn has overtaken Jupiter as the planet with the most satellites in our solar system. How many moons does ...