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

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

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

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.

Since the 1990s, scientists have discovered approximately 6,100 planets outside our solar system, called exoplanets.

The milestone highlights the accelerating rate of discoveries, just over three decades since the first exoplanets were found. The official number of exoplanets — planets outside our solar system — ...

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 ...

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

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

A University of Arizona-led team discovered a growing planet, WISPIT 2b, forming inside a disk gap around a young star. The finding confirms theories that protoplanets carve out gaps in disks of gas ...

The Milky Way just got a lot more crowded — with planets. NASA on Tuesday announced 1,284 new planets orbiting stars outside our solar system, called exoplanets. That's on top of the approximately ...

Webb Telescope finds crystalline water ice around star HD 181327. This discovery could reveal how icy bodies contribute to ...