The latest analysis of data from the Galileo probe reveals surprising clues about Callisto, one of Jupiter's moons. These discoveries could change our understanding of this icy satellite.

READ MORE: {{title}} NASA’s Galileo spacecraft, which was designed to study the large, gaseous planet Jupiter and its moons, first caught hints of this secret ocean back in the 1990s ...

The Jupiter orbiter is the second spacecraft to visit the moon and the gas giant it orbits, after the Galileo probe. The next big moment for Juno is coming in Sept. 2022 when the probe settles in ...

Europa's frozen, fissured surface, seen here in a colorized mosaic image from the Galileo spacecraft, hides a liquid ocean that may hold all the ingredients needed for life. Three key ingredients ...