The <a href="https://en.wikipedia.org/wiki/First_observation_of_gravitational_waves" id="mwAVw" rel="mw:WikiLink" title="First observation of gravitational waves">first observation of gravitational waves</a> is made, announced by the <a href="https://en.wikipedia.org/wiki/LIGO" id="mwAV0" rel="mw:WikiLink" title="LIGO">LIGO</a> and <a href="https://en.wikipedia.org/wiki/Virgo_interferometer" id="mwAV4" rel="mw:WikiLink" title="Virgo interferometer">Virgo</a> collaborations on 11 February 2016.