Humans have been observing comets for thousands of years. Though comets appear infrequently, when they do appear, they can be visible to the naked eye at night as a bright white star with a long, ...

A green comet recently discovered by astronomers may become bright enough to be visible to the naked eye. An image of the comet, known as Comet C/2022 E3 (ZTF), was published on Monday by NASA. It was ...

An in-bound comet 1.5 billion miles from the sun has been pictured making the long journey from the edge of the solar system. The miles-wide lump of frozen water, gas and dust photographed by the ...