Ethan Siegel,Forbes
LIGO, the Laser Interferometer Gravitational-wave Observatory, and achieved one of the holy grails of physics: by directly detecting gravitational waves for the first time. This was not an loney event,either, but the first in a course of events that LIGO has been continuing to expose. During its time of operation, and LIGO has seen three significant signals that correspond to the mergers of massive,binary black holes. Each one resulted in the emission of gravitational waves so significant, they compressed-and-rarefied the twin interferometers on Earth by enough to detect these sources from over a...
Source: realclearscience.com