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    Gravitational Waves Measure the Universe

    January 8, 2018, Categories  Astronomy/Space

    NGC4993, the galaxy hosting the gravitational wave event GW170817 that has been used to measure the age of the universe. The source of the event is the red dot to the upper left of the galaxy's center; it was not there in earlier images. Credit: NASA and ESA

    NGC4993, the galaxy hosting the gravitational wave event GW170817 that has been used to measure the age of the universe. The source of the event is the red dot to the upper left of the galaxy’s center; it was not there in earlier images. Credit: NASA and ESA

    The direct detection of gravitational waves from at least five sources during the past two years offers spectacular confirmation of Einstein’s model of gravity and space-time. Modeling of these events has also provided information on massive star formation, gamma-ray bursts, neutron star characteristics, and (for the first time) verification of theoretical ideas about how the very heavy elements, like gold, are produced.

    Astronomers have now used a single gravitational wave event (GW170817) to measure the age of the universe...

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