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

On Dec. 8, 1990, NASA's Galileo spacecraft flew by Earth on its way to Jupiter. Galileo was the first spacecraft to study Jupiter and its moons for an extended period of time, and it actually flew ...

As the innermost of Jupiter’s Galilean moons, Io offers a glimpse into some of the most extreme geologic phenomena in the ...

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

Amalthea, however, is tricky to spot even when you have a spacecraft. NASA's Galileo mission imaged Amalthea in 1999. Large impact craters are visible. American astronomer Edward Emerson Barnard ...

The first close-up images of Io since NASA’s Galileo mission in 1997 revealed the emergence of a fresh volcano with multiple lava flows and volcanic deposits covering an area of about 180 ...

In the 1990s, NASA's Galileo mission performed magnetic induction measurements that suggested there was such a layer, while more recently, the distribution of volcanoes on Io mapped by NASA's Juno ...

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 ...

The 'Blue Marble': The iconic and stunning view of Earth, now known as the 'Blue Marble' was taken by the crew of the last ...