RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Alien landscape. Artwork of a lake and mountains on a planet located near a globular star cluster. The planet's moon is seen in the night sky. The core of the globular star cluster is at centre left. A globular star cluster, a dense spherical collection of stars, can contain over a million stars within a volume only a few hundred light years across. Globular star clusters formed early in the history of the universe, and their stars are thought to be among the oldest known. Many globular star clusters are far older than the galaxies they now orbit.
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