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 ...