Comets

For years, amateur astronomers have been waiting for a bright, naked-eye comet to pass by Earth — and finally, such an object may have arrived.

As Rosetta's comet got near enough to the sun for frost to evaporate off its surface, a color-changing water and dust cycle began that shuffled its colors around.

For the first time, a Polish group has identified two nearby stars that seem to have plucked up their icy partners, swinging them into orbits around our sun.

Observations of the interstellar Comet Borisov have been flooding in for six weeks, and the more astronomers duplicate one another's work, the more confident they are in their analysis of the object.

Comet 67P's head has spent 4.5 billion years trying to twist away from its neck. And that's caused some stress fractures.

'Oumuamua is long gone, but it's still leaving scientists guessing. A new explanation proposes that the strange object was a "monstrous fluffy dust aggregate" produced by a busted-up comet.

As comets blaze across the night sky, they can bring wonder and excitement to those watching from Earth – or even a sense of impending doom.

Rosetta's comet sent a magnetic shock wave screaming out in front of it, blazing a trail through the stellar wind. And scientists just found it.

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.