| http://www.w3.org/ns/prov#value | - As space expands faster and faster, it becomes more difficult for gravity to pull matter together and form structures such as galaxy clusters, said lead author Adam Mantz, a researcher at NASA's Goddard Space Flight Center and former graduate student at KIPAC. By observing clusters at a range of distances, the researchers found that the present-day universe contains fewer clusters than would be
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