A Collision Between Gigantic Galaxy Clusters. Too Big, Too Early

Astronomers take another look at gigantic galaxy clusters by finding the mass of the El Gordo cluster. They find that it formed too early.

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United Kingdom ,Bonn ,Nordrhein Westfalen ,Germany ,Scotland ,Pavel Kroupa ,Indranil Banik ,El Gordo ,Elena Asencio ,Charles University ,School Of Physics ,University Of Bonn ,Cosmic Microwave ,Hubble Space Telescope ,Bullet Cluster ,