Why is it always the last place you look?
, suggest that it may be concentrated in supermassive black holes at the center of galaxies.
"This is a really surprising result," said co-author Dave Clements, a physicist from Imperial College London, in a . "We started off looking at how black holes grow over time, and may have found the answer to one of the biggest problems in cosmology."The researchers first observed the masses of supermassive black holes in younger and denser galaxies and compared them to the masses of such black holes in dormant galaxies where, in contrast, there's little material left to be devoured.
But surprisingly, they discovered that the black holes in dormant galaxies are actually between 7 and 20 times larger than they were nine billion years ago. From additional measurements taken of related galaxies across the evolution of the universe, the researchers believe the masses of these black holes increased as the universe grew. In other words, the masses of black holes are "cosmologically coupled" with the expansion of the universe, they claim.
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