A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

A closer look at the planets around a star called LHS 1903 may just flip our understanding of how planetary systems form.

Planetary systems in the Milky Way galaxy tend to follow a particular pattern: rocky planets toward the center, closest to ...

Add Yahoo as a preferred source to see more of our stories on Google. Digital art of distant planet - Dottedhippo/Getty Images On August 24, 2006, our solar system lost a planet. It wasn't by ...

The fourth planet in the system is a rocky world, while the second and third ones are gas planets.

A newly studied solar system breaks the usual planet pattern, raising fresh questions about how rocky and gas planets form.

Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that ...

LONDON — The search for an unknown planet in our solar system has inspired astronomers for more than a century. Now, a recent study suggests a potential new candidate, which the paper's authors have ...

Astronomers have found a distant world that challenges planetary formation theory, with a rocky planet where gas giants should be.

The curious minds at What If predict the effects if Planet X entered our solar system, revealing orbital chaos, climate ...

Gas giants possibly developed slowly in the solar system. They developed cores layer by layer within a disk of ice and dust ...