RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Alien landscape. Artwork of mountains and a rocky landscape on a planet located near an open star cluster. Two of the planet's moons are seen in the night sky. The core of the open star cluster is at top right. An open star cluster, found within a galaxy, is a loose grouping of stars. The stars tend to be young, sometimes forming from the same nebula, but can be of any age. The number of stars can be in the hundreds, but can also be much less. Over time, due to the gravitational forces exerted by other stars in the galaxy, the stars of an open star cluster will drift apart.
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