In a new study, a team of astrophysicists, including two researchers at CU Boulder, have discovered a small and rocky world orbiting a star far from Earth—similar to our own planet, perhaps, but much ...

The galaxy’s most common stars rarely host sub-Neptune planets, revealing a new pattern in how close-in worlds form.

Astronomers have detected a rogue planet roughly the size of Saturn wandering alone through the Milky Way. Unlike most planets, it does not orbit a star but drifts through space on its own. This ...