A recent study found that Jupiter was once twice the size that it is now, making it big enough to swallow up 2,000 Earths.

Jupiter has long been a source of fascination for astronomers, and now, the giant planet is raising more questions than ever.

Jupiter is already the biggest planet by far in our solar system ... 100-mph winds pummeling its northern reaches and a rocky moon named Io orbiting it that is notoriously riddled with lava ...

The nights surrounding June 7 will see Jupiter and Mercury crowd together close to the horizon in the northwestern sky.

Scientists using NASA's Hubble Space Telescope went looking for evidence of one phenomenon and found quite another.

In the early 1600s, Dutch spectacle maker Jan Lippershey discovered that combining lenses could magnify distant objects.

New Hubble observations reveal unexpected darkening on Uranus’ moons, challenging long-held assumptions about its ...

To work out the size of early Jupiter, scientists studied the tilted orbit of two of the planet's tiny moons, which can remain unchanged for billions of years.