Astronomers have measured the Universe's current rate of expansion to within 5% — twice as a precisely as before. Adam Riess of the Space Telescope Science Institute in Baltimore, Maryland, and his team used the Hubble Space Telescope to refine previous estimates of the Hubble constant, which relates the speed at which galaxies race apart to their distances from each other. They found the constant to be 74.2 kilometres per second per million parsecs.
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