This is the fourth comet Gröller has discovered, but given its extraordinary distance, it was the most exciting find, he says ...

If spotted, the comet is expected to take on a circular cloud-like shape with a brighter center and a faint dust tail — in comparison to other comets, which tend to be brighter and more elongated.

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

Photo: Lionel Majzik The comet on January 21, seen from Cerro Paranal in Chile. The Very Large Telescope is on the left. Photo: Florentin Millour Gas and dust particles created multiple tails in ...

The comet's head — surrounded by a cloud of gas and dust from the sun vaporizing its ice — is a "pleasing blue-green color," King added. Read next ...

This story appears in the July 2013 issue of National Geographic magazine. The dust speck had been plucked from the tail of a comet more than 200 million miles away. Now, under an electron ...

For example, the Perseid meteor shower happens in August each year when the Earth travels through the trail of dust from comet Swift-Tuttle." Sharing his tips for watching meteor showers ...

This processed Hubble image shows the bright jets of dust emanating from the nucleus more clearly. A portion of the Hubble image shows three companions to comet Hyakutake. Scientists believe that ...

The comet was beautifully captured by César Briceño ... Twin tails are seen emerging from the nucleus. A dust trail made up of heavier dust particles that are lit by reflected sunlight makes ...