We may know where the bizarre, cigar-shaped interstellar object 'Oumuamua came from

Comet's historic flyby may be visible for the holidays

When Earth gets this colorful sheen, it's called airglow

Starman's Tesla now cruising well beyond Mars

One of the oldest stars was just found mysteriously lurking in our galactic backyard

BepiColombo spacecraft to probe the secrets of Mercury

The controversy behind the world's next great telescope

Otherworldly light pillars captured over Whitefish Bay

NASA just came up with a brilliant way to turn Martian soil into rocket fuel

The Kepler Space Telescope is dead. Long live Kepler!

What's the difference between mass and weight?

Earth may have two dusty 'ghost moons'