Planets

The video, captured during the testing phase of NASA's new satellite for finding exoplanets, shows a bright white comet drifting past black, jiggling stars.

Nearly a half century after astronauts first visited the moon, it is once again a flash point for debates on how to safely, responsibly explore the solar system.

If Earth suddenly turned into an Earth-size pile of blueberries, things would start exploding. This is science.

Blue crystals in meteorites contain evidence of the sun's volatile past.

Sizzling-hot rocks explode and ooze onto the surfaces of several extraterrestrial worlds.

Scientists have discovered 12 previously unknown moons orbiting Jupiter, and one of them is a real oddball.

What's really happening when Mars is in retrograde?

If aliens are out there, humans might kill them all in their never-ending quest for expansion.

The odd shapes of the inner moons of Saturn, from ravioli to potatoes, may be due to mergers of tiny moonlets, a new study finds.

The solar system just got a bit stranger.

The long-simmering argument about Pluto's planethood has just flared up again.

A huge asteroid may be lurking at the fringes of our solar system.

When our sun finally goes out, what will it look like?

German mathematician Johann Carl Friedrich Gauss used math to find the lost dwarf planet Ceres, and a Google Doodle commemorates what would have been his 241st birthday.

Rosetta's weirdly shaped comet may have formed in a cosmic kiss inside a dirt cloud, thanks in part to Neptune's protective shadow.

The gassy world is "darker than charcoal" and may swallow up to 99 percent of the light its local star sheds upon it.

The upper cloud tops of Uranus are shot through with hydrogen sulfide, the gas that smells of rotten eggs.

The lost planet was the size of Mercury or perhaps Mars, researchers now say.

The space travel of science fiction could be closer than you think.