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

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

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

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

A global team of astronomers, led by the University of Warwick, have used a European Space Agency (ESA) telescope to discover ...

Surprised astronomers said Thursday they have discovered a star with planets in a bizarre order that defies scientific expectations -- and suggests these faraway worlds formed in a manner never seen ...

The planetary system, located 120 light-years away, features four worlds orbiting a red dwarf star and challenges classical formation schemes.

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

Using HARPS and HARPS-N spectrographs, astronomers have observed a nearby K-type star designated HD 176986, known to host two ...