Comet A3 hasn't been past Earth since the Neanderthals. Your last chance to see it is approaching fast. Here's where and how to spot it.

Lighter particles form the comet’s tail while heavier ones fall back on to its surface, building a crust. That time a car-sized asteroid flew near Earth and scientists didn’t know Observing ...

In the days following its perihelion, people around the world snapped some stunning pictures of the comet and its spectacular tail. While not visible from the Northern Hemisphere, people in the ...

Frost at the Yerkes Observatory saw the comets nucleus as bright as Regulus, the chief star in the Sickle with a tail 5 or 6 degrees in length. Under slightly more favorable circumstances ...

The photo of Comet Hyakutake (left) was taken in March 1996, on the night of its closest approach to earth. That night it was a brilliant fuzzball with a delicate tail that stretched for 70 degrees ...

The comet was beautifully captured by César Briceño ... The lower stream is composed of gases that glow from ionization. This tail points in a different direction than the first one because ...

It has long been assumed that the gases of a comet tail are pushed away from the comet by the pressure of light from the sun. It now appears that many tails are caused by a wind of charged particles ...

And high above, comet Hale-Bopp hung suspended like a feathery fishing lure, its tail curving off a bit, as if blown to the side by the punishing wind. One by one, stars winked on in a darkening sky.

The boiling is so intense, that the world has developed a comet-like tail stretching 350,000 miles behind it, scientists announced on Tuesday. Don't retire on this planet The planet, called WASP ...

The brightest object left of center is the moon, while the faint, wispy tail of comet C/2024 G3 (ATLAS) can be seen at the far left, just to the right of one of the observatory's telescopes.