The largest known object in space that is not a galaxy is a quasar group. It is a collection of extremely bright and energetic quasars that are powered by supermassive black holes at the centers of galaxies. The record-breaking quasar group discovered in 2013 spans more than 4 billion light-years across and contains 73 quasars. That's about 40,000 times larger than our Milky Way galaxy!
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