Learn about the unexpected discovery that has shaped new perspectives on Uranus' moons and their brightness.

Scientists using NASA's Hubble Space Telescope went looking for evidence of one phenomenon and found quite another.

Jupiter joins Mercury in early twilight as Mars lingers with Leo after dark. Saturn is visible in the morning, meeting ...

For the dwarf planet candidate, one trip around the sun takes over 24,000 years. Its orbit challenges a proposed path for a hypothetical Planet Nine.

The International Space Station can sometimes seem like a menagerie, housing (on different occasions) everything from frogs to worms, crickets, mollusks, butterflies, and even quail. This past ...

CALIFORNIA — The four-person civilian Fram2 mission returned home in a splash down off the coast of California on Friday after being the first humans to orbit Earth's polar regions. Riding in ...