Scientists found proof that a giant early planet existed in the solar system 4.5 billion years ago.

The ingredients that help make a planet livable did not necessarily come from where many scientists once thought. A new ...

New research suggests the moons of Jupiter and Uranus may hint that our planetary neighborhood once had a third ice giant.

NASA-supported scientists have provided new information about how the early Earth may have acquired some elements necessary ...

Explore how a cosmic 'planet factory' shaped the Solar System, producing distinct worlds from a dust ring beyond Jupiter.

Scientists may have identified one of the Solar System’s most important “planet factories” hidden just beyond Jupiter.

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. Astronomers have found a distant celestial body — ...