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 ...

These tails form because comets have ice in them, while asteroids supposedly do not. When a comet gets close to the Sun, these ices heat up and sublimate, which means they turn from ice into gas.

Following perihelion, the comet showed signs of disintegration but still put on a dazzling display of bright tails. As it heads toward the edge of the solar system, it will slowly start to fade.

Those were long-exposure images, meaning the color and notable tail captured by the camera is deceptive to the naked eye. If spotted, the comet is expected to take on a circular cloud-like shape ...

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 nuclei of most comets are about 1-2 miles across ... reflection of sunlight on the dust streaming from the comet, and a fainter ion tail, which is composed of electrically charged atoms ...

These tails form because comets have ice in them, while asteroids supposedly do not. When a comet gets close to the Sun, these ices heat up and sublimate, which means they turn from ice into gas. The ...