MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Alien night sky. Artwork of a view from the surface of an Earth-like planet on the outskirts of a globular star cluster. A ringed gas giant planet and a moon are at upper right. A globular star cluster is a densely packed ball of thousands to millions of stars. The stars found in globular star clusters are thought to be among the oldest stars known. The Milky Way galaxy has a spherical halo of globular star clusters associated with it, and a gas giant planet has been detected within one of them.
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