DAVID A. HARDY / SCIENCE PHOTO LIBRARY DAVID A. HARDY / SCIENCE PHOTO LIBRARY
Globular cluster. Computer artwork of a view across rock formations on the surface of an alien planet, towards its moon (centre) and a globular star cluster in the sky above. Globular clusters are dense spherical collections of stars that can contain over a million stars within a volume only a few hundred light years across. They formed early in the history of the universe and their stars are thought to be amongst the oldest known.
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