Because of its huge mass, the galaxy cluster bends the light of background objects, acting as a magnifying lens.
Astronomers believe they can use this phenomenon to find galaxies that existed only hundreds of millions of years after the Big Bang.
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This beautiful cosmic kaleidoscope is two colliding galaxy clusters forming a single object: https://t.co/FuzAeEBVQE pic.twitter.com/oFutmWU2qn
— NASA (@NASA) March 25, 2016