LYNETTE COOK / SCIENCE PHOTO LIBRARY LYNETTE COOK / SCIENCE PHOTO LIBRARY
Globular star cluster planet. Artwork of the core of a globular star cluster reflected in water on the surface of an alien planet. Globular clusters are huge, old groups of hundreds of thousands of stars. Numerous red giants are seen in the cluster. These are old stars that have expanded and reddened. Several bright blue stars are also seen. Globular star clusters are thought to have formed very early in the life of the universe, and contain few of the heavy elements that form planets. They exist in large spherical halos around many galaxies.
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