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Gravitational Lensing in Galaxy Cluster Abell 2218 The Vault
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Your eyes aren't playing tricks on you. This image of a massive cluster of galaxies, called Abell 2218, does show several arc-shaped patterns, which are duplicate images of galaxies that lie five to 10 times farther than Abell 2218. How can that happen? The cluster is so massive that its enormous gravitational field bends, distorts, and duplicates light rays passing through it. This phenomenon is called a gravitational lens.
(Longer Caption)


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