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Abell 2029
Abell 2029 is a large cluster of galaxies a billion light years away in the constellation Serpens, close to its boundary with Virgo The central galaxy (IC 1101]) is perhaps the largest known, with estimates ranging from 5.6 to over 6 million [[light years across; contrast this with the Milky Way, which is 100,000 light years across.
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