Astronomers have discovered a giant Saturn-sized planet orbiting TOI-6894, the smallest star ever known to host such a world.

An international team of astronomers, co-led by researchers at the University of Galway, has made the unexpected discovery of ...

The textbook picture of how planets form—serene, flat disks of cosmic dust—has just received a significant cosmic twist.

The remaining dust and gas form a protoplanetary disk that encircles the new star, which slowly accretes to form systems of planets.

A quick guide to planets, including the eight in our solar system, how they form, and how many could be in the universe.

New observations of dust around young stars suggests collisions of large asteroid-like objects and fledgling planets are frequent. But that doesn't likely stop the formation of rocky planets like ...

The question of "what is a planet?" has always been a thorny one, and even more so since the Pluto demotion fiasco of 2006. Now there's a new proposed definition for planethood, but it focuses not ...