Dark comets are often small, just a few metres to a few hundred metres wide. This leaves less surface area for material to escape and form into the beautiful tails we see on typical comets.

NASA scientists are closely studying a new class of celestial objects known as "dark comets", the little-known celestial objects which have been challenging the human understanding of both comets ...

A widely held view is that these vital components were deposited on Earth by a long bombardment of icy comets. Comets are made of dust and ice. Astronomers have examined the water contained in ...

With all the attention given to the bright, passing comet 46P/Wirtanen, we sometimes forget that such minor planetary bodies are very likely to be ubiquitous throughout the cosmos. After ...

Its speed and path around the Sun don’t match a typical asteroid, but it also has no bright tail or nucleus (icy core) we normally associate with comets. However, 'Oumuamua has erratic motions ...