Hubble is often associated with distant galaxies, but some of its most surprising discoveries were much closer to home. From unexpected activity on planets to hidden details in familiar worlds, its ...

A planetary system 116 light-years from Earth has a peculiar pattern. It could flip the script on how planets form, scientists say.

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

Add Yahoo as a preferred source to see more of our stories on Google. But now a fourth and much larger object has been spotted entering the solar system, and the scientific community is rushing to ...

Add Yahoo as a preferred source to see more of our stories on Google. The interstellar comet, originally called A11pl3Z and now known as 3I/Atlas, was first reported by the Asteroid Terrestrial-impact ...

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