Every planet, moon, asteroid, and comet in the solar system combined accounts for a sliver of its total mass. The Sun holds ...

What if Jupiter gained just a little bit more mass during its formation period, and then ignited to become a star? How ...

Using the Keck Observatory, astronomers measured the spins of dozens of giant planets and brown dwarfs orbiting distant stars ...

This week's science news.

For some time, astronomers have theorized that there is a connection between planetary mass and rotation. In the solar system, Jupiter and Saturn both rotate rapidly, completing a rotation in roughly ...

The hunt for Planet Nine continues as new discoveries make the Solar System’s biggest mystery even harder to solve. Is there ...