Galaxies swarm and light bends under dark matter's sway

Bad Astronomy
By Phil Plait
Oct 14, 2011 4:08 PMNov 20, 2019 12:41 AM

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Before I do anything else, I simply have to present this insanely cool Hubble image of the galaxy cluster MACS J1206, which lies at the mind-numbing distance of 4.5 billion light years from Earth:

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