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

We know that our Solar System is not the blueprint for all planetary systems out there. There are gas giant planets orbiting ...

By Will Dunham WASHINGTON, Feb 14 (Reuters) - Astronomers have observed a planetary system that challenges current planet ...

Astronomers have spotted an unusual 'inside-out' planetary system where a rocky world seems to have formed far beyond the realm typically reserved for gas giants.

Astronomers have found a compact solar system whose planets line up in a way that, according to current models, should not be ...

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

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 ...

In the remote outer reaches of planetary systems, far beyond the orbit of known planets, enormous and mysterious worlds silently loop around their stars. Some drift as far as 10,000 times the distance ...

This artist's concept illustrates the results of a new study that measured the masses of many planets relative to the stars that host them, leading to new information about populations of planets in ...