On Sept. 21, 2003, NASA's Galileo mission to Jupiter and its moons came to an end. After 14 years of exploration, the Galileo ...

NASA’s missions revealed Ganymede isn’t just big—it has a magnetic field, icy oceans, and mysteries that could rewrite what ...

The ocean on Ganymede may have more water than all the water on Earth. In this artist’s concept, the moon Ganymede orbits the giant planet Jupiter. NASA’s Hubble Space Telescope observed aurorae on ...

Large pieces of dark matter hitting Jupiter’s largest moon would form distinctive craters in its icy surface, and upcoming ...

In a landmark observation by a team of international researchers, NASA's Juno spacecraft has, for the first time, clearly ...