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A new ring of black holes or neutron stars has been discovered in a galaxy about 300 million light years from Earth. This ring was forged when one galaxy smashed through the middle of another, creating ripples in the gas. As this gas expanded through the impacted galaxy, called AM 0644-741, it triggered waves of star formation. The most massive of these stars lasted only a few million years, before exploding as supernovas and leaving behind black holes or neutron stars as their remains. NASA's Chandra X
