A polar bear stands on floating sea ice in the Arctic. The bears rely on sea ice to move throughout their hunting grounds.

An unusual planetary system with three known ultra-low density "super-puff" planets has at least one more planet, according ...

New research suggests that tiny primordial black holes could be hollowing out planets and passing through everyday objects, ...

Scientists used the Hubble Space Telescope to observe a star with a planet-forming disk that gets to absolutely scorching ...

The youngster is less than 3 million years old, and raises questions about how planets form from the cosmos' dusty ether.

Most Planet Fitness locations will be open on Thanksgiving, though hours may vary by location, as they are owned and operated ...

In a world where the climate is increasingly hot and volatile, farmers are having trouble keeping their crops cool. A startup ...

Astronomers discover a fourth planet in Kepler-51, challenging planetary formation theories with new questions.

Planet Labs (NYSE: PL) stock slipped 3% through 9:50 a.m. ET Wednesday on what investors would ordinarily consider good news: another contract announcement. Planet revealed today that it has "expanded ...

The discovery of Kepler-51e sheds light on the unusual transit patterns of the system's existing super-puff planets.

Skeleton Crew fans already have some big theories about Star Wars' mysterious new planet. Taking place at the same time as ...