Two icy moons of Jupiter, though neighboring and of similar size, exhibit radically different internal structures. A new study suggests this dichotomy stems from their very formation, ...

On November 5, 2002, NASA's old Galileo spacecraft was almost out of fuel. But the Jupiter mission still had some science to do. ‘On This Day in Space’ Video Series on Space.com Galileo flew ...

On October 29, 1991, the Galileo spacecraft flew by the asteroid Gaspra on its way to Jupiter. ‘On This Day in Space’ Video Series on Space.com Gaspra was the first asteroid to ever be visited ...

Liftoff of the Galileo L13 mission occurred at 6:50 p.m. ET. A SpaceX Falcon 9 rocket launched two European navigation satellites tonight (Sept. 17) and then landed safely, acing its 22nd mission ...

On Aug. 28, 1993, NASA's Galileo spacecraft flew by the asteroid Ida on its way Jupiter. Galileo was the first spacecraft to fly by an asteroid in the asteroid belt. Ida was actually the second ...

Then, in the 1990s, NASA's Galileo mission captured legendary views of Europa's chaotic, ridged surface — suggesting there was water near the top. What's more, the spacecraft detected a strong ...