Published 6 December in Nature https://www.nature.com/articles/nature25180 https://www.nature.com/articles/nature25180 The crucial thing is how they develop t

Published 6 December in Nature https://www.nature.com/articles/nature25180 https://www.nature.com/articles/nature25180 The crucial thing is how they develop their argument that this supermassive black hole (SMBH) and a pair of others (out of a selection of high redshift SMBHs) must have been forming in the "dark ages" between the surface of last scattering (that forms the cosmic microwave background) and the age of reionization, when collapsing matter's radiation began stripping electrons from neutral hydrogen atoms.