Certain extreme planets are called ultra-short period objects if they're very close to their stars and orbit them in mere hours, like K2-22b.

NASA and European scientists explain how they calculate the probability of the space rock 2024 YR4 impacting our planet, and why it’s not yet time to worry.

Ceres, the largest object in the asteroid belt, is a dwarf planet with frozen oceans and hints of ancient habitability, setting it apart from its rocky neighbors. With a solid core, icy mantle ...