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"Natajan emphasizes that "special conditions" are required to form these DCBHs: a small primordial cloud of hydrogen and helium gas sitting at just the right distance to a much larger star-forming galexy. This explains why high-redshift quasars are uncommon. "The conditions you need are pretty stringent to make direct collapse black holes," she says. Those conditions are rare in the early universe, but they are available. Luckily these monster black holes are very rare, so you can accommodate what is seen so far easily, without a problem."
Astronomy Magazine March 2021 "How to Grow a Giant Black Hole" pp. 16-23
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