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

An international team of astronomers has discovered a distant planetary system that challenges long-standing theories of how ...

Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that formed beyond the orbits of its gaseous neighbors, possibly after much of the ...

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

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

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 ...

Scientists have identified a rocky outer planet in a system where a gas giant was expected. The discovery challenges ...

Astronomers have found a rocky planet where it should not exist, orbiting far from a cool red star. Could this strange ...

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

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

Six planets will shine together in the evening sky on Feb. 28. Here's how to get the best view before they disappear.

Exoplanet-hunters have found a rare star system containing seven planets after poring through data from a space telescope that stopped working in 2018. Exoplanets are planets that orbit around stars ...