![]() This was linked to a concept Einstein had proposed but later discarded-a ' cosmological constant' that opposed gravity and kept the universe from collapsing. To account for this, it was proposed that a 'dark energy' was responsible for pushing things apart more strongly than gravity. This is difficult to explain-the pull of gravity between all objects in the universe should be slowing the expansion down.Įxplainer video with RAL Space's Dr Chris Pearson. In the 1990s, it was discovered that the expansion of the universe is accelerating-everything is moving away from everything else at a faster and faster rate. Chris Pearson, from STFC RAL Space, said, "If the theory holds, then this is going to revolutionize the whole of cosmology, because at last we've got a solution for the origin of dark energy that's been perplexing cosmologists and theoretical physicists for more than 20 years." 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." Dave Clements, from the Department of Physics at Imperial, said, "This is a really surprising result. The work is published in two papers in the journals The Astrophysical Journal and The Astrophysical Journal Letters. The conclusion was reached by a team of 17 researchers in nine countries, led by the University of Hawai'i and including Imperial College London and STFC RAL Space physicists. ![]() ![]() The result potentially means nothing new has to be added to our picture of the universe to account for dark energy: black holes combined with Einstein's gravity are the source. The measurements from ancient and dormant galaxies show black holes growing more than expected, aligning with a phenomenon predicted in Einstein's theory of gravity. ![]()
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