ECKHARD SLAWIK / SCIENCE PHOTO LIBRARY ECKHARD SLAWIK / SCIENCE PHOTO LIBRARY
Globular cluster. Optical image of the globular star cluster Omega Centauri (NGC 5139, lower right) in the constellation Centaurus, the centaur. North is at top. Omega Centauri is a ball of over a million stars which lies 16,000 light years from Earth. Globular clusters are found in a halo around the Milky Way and are thought to be very old structures.
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