Combining with one other previously confirmed planet, one of our closest stellar neighbors now has a family of four.

"L 98-59 c could be the first planet smaller than 2 Earth radii with a definitively detected atmosphere," a team of ...

A powerful new observatory is the best hope yet for finding the elusive Planet 9, a large planet that some scientists say is ...

A new mission concept that would see a fleet of telescopes probing rocky planets in their stars' habitable zones should be ...