Jupiter passes 100 moons while Saturn reaches 285 as astronomers confirm 15 new discoveries.

A new study reveals how Jupiter’s powerful magnetic field helped its moons survive, while Saturn lost most of its large moons ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

The two largest planets in our solar system, Jupiter and Saturn, also have the largest satellite systems, or the most moons.

There’s no mistaking Jupiter in the sky these Pottsville winter evenings, rising in the southeast as evening twilight ends. In fact you should be able to easily see it long before twilight fades.

A comet from another star system will swing by Mars on Friday as a fleet of spacecraft trains its sights on the interstellar visitor. We already know a decent amount about how planets form, but moon ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. The action will happen in the east-northeast night sky about ...

Add Yahoo as a preferred source to see more of our stories on Google. Heads up, sky watchers and star gazers! April's full moon is still just over a week away, but there will be a very bright planet ...

If you’re in the mood for a little late-night magic, you’re in luck! Just after midnight, the moon — now passing its last quarter phase — will light up the east-northeastern horizon, cozying up right ...

This first-ever complete map of Jupiter's volcanic moon Io released on March 19, 2012, was created using data and images from NASA's Galileo spacecraft, (which studied Jupiter and its moons between ...