Astronaut Don Pettit took this stunning photo of a nearby comet from the International Space Station ...

A once-in-a-lifetime comet just made its closest approach to the Sun, becoming visible for the first time in 160,000 years.

NASA launched its Deep Impact mission to crash into comet Tempel 1, also known as 9P/Tempel. Two spacecraft were launched ...

A comet last seen 160,000 years ago will be bright and visible in the skies over the UK this week as it makes its closest ...

G3 (ATLAS) should be visible from the southern hemisphere, and possibly also the northern hemisphere, over the next few days ...