The Chirp Heard Round the World: How Scientists Confirmed the LIGO Detection

Lights in the Dark

It’s been a year since researchers with the Laser Interferometer Gravitational-wave Observatory (LIGO) announced the first direct observations of gravitational waves, the oscillations in the fabric of space and time created by powerful cosmic events—like the merging of two massive black holes. This cosmic phenomenon was first predicted by Einstein in 1915, but it took a century for technology to become capable of detecting it. On Sept. 14, 2015, the twin LIGO observatories in Louisiana and Washington state both registered an oh-so-subtle shake that came from far outside our planet…1.3 billion light-years away, in fact.

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