For decades, astronomers believed that Jupiter’s unusual interior was the scar of a violent past — the aftermath of a massive ...

Jupiter, the fifth planet from the Sun, is between Mars and Saturn. It’s the largest planet in the solar system, big enough for more than 1,000 Earths to fit inside, with room to spare.

A new study sheds light on what Jupiter, often called the "architect" of the solar system, was like in the beginning. The giant planet has dramatically changed.

The team's calculations indicate that young Jupiter had a radius nearly twice its current size, with a volume large enough to hold more than 2,000 Earths. As the bloated, magnetic powerhouse ...

In its earliest days, Jupiter may have been even more colossal than it is now—twice as large, in fact, with a magnetic field 50 times stronger than today's.

We already know a decent amount about how planets form, but moon formation is another process entirely, and one we're not as ...