The “Cosmic Horseshoe” is an Einstein ring, a system made up of a foreground galaxy whose mass is so great, it warps the light from a galaxy behind it. Now, astronomers know where it gets this mass from.
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The “Cosmic Horseshoe” is an Einstein ring, a system made up of a foreground galaxy whose mass is so great, it warps the light from a galaxy behind it. Now, astronomers know where it gets this mass from.