NASA's Hubble Spots Rare Gravitational Arc from Distant, Hefty Galaxy Cluster

Astronomers using the Hubble Space Telescope have found a puzzling arc of light behind an extremely massive cluster of galaxies residing 10 billion light-years away. The galactic grouping, discovered by the Spitzer Space Telescope, was observed when the universe was roughly a quarter of its current age of 13.7 billion years. The giant arc is the stretched shape of a more distant galaxy whose light is distorted by the monster cluster's powerful gravity. The trouble is that the arc shouldn't exist.

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