The supermassive black holes lurking at the heart of ancient galaxies are smaller than the ones in our nearby, modern slice of the universe. However, compared to the mass of stars in their host galaxies, these black holes almost seem too big.
Over the last few months, astronomers have published what Pacucci describes as 'an explosion of studies' reporting ancient, distant galaxies with supermassive black holes that seem too massive - or 'overmassive,' as Pacucci puts it to the AAS crowd.
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