The mystery of the universe’s expansion seems to have deepened based on new measurements from the NASA/European Space Agency (ESA) Hubble Space Telescope (HST). The size, mass, age, composition and geometry as well as the ultimate fate of the universe may rest with the accuracy of the estimate. The expansion itself was noted nearly a century ago by the late American astronomer Edwin Hubble, for whom the 29-year-old HST and the expansion rate of the universe, or Hubble constant, are ...

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