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Gravitational wave detector LIGO is back online after 3 years of upgrades – how the world's most sensitive yardstick reveals secrets of the universe

  • Written by Chad Hanna, Professor of Physics, Penn State
Gravitational wave detector LIGO is back online after 3 years of upgrades – how the world's most sensitive yardstick reveals secrets of the universeWhen two massive objects – like black holes or neutron stars – merge, they warp space and time. Mark Garlick/Science Photo Library via Getty Images

After a three-year hiatus, scientists in the U.S. have just turned on detectors capable of measuring gravitational waves - tiny ripples in space itself that travel through the universe.

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