DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY DETLEV VAN RAVENSWAAY / SCIENCE PHOTO LIBRARY
Close-up of the surface of a comet, computer artwork. A comet is a small, icy space rock. When passing close to the sun, solar wind and radiation will heat up the comet and cause it to expel gas, creating a sort of gaseous atmosphere around it and a trail in its wake. Comets can vary in diameter from a few metres to several kilometres.
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