Massachusetts Institute of Technology astrophysics professor Nergis Mavalvala, center, takes questions from members of the media with MIT physics professor Matthew Evans, left, and research scientist Erik Katsavounidis during a presentation on the discovery Thursday of gravitational waves.
Massachusetts Institute of Technology astrophysics professor Nergis Mavalvala, center, takes questions from members of the media with MIT physics professor Matthew Evans, left, and research scientist Erik Katsavounidis during a presentation on the discovery Thursday of gravitational waves. Steven Senne AP
Massachusetts Institute of Technology astrophysics professor Nergis Mavalvala, center, takes questions from members of the media with MIT physics professor Matthew Evans, left, and research scientist Erik Katsavounidis during a presentation on the discovery Thursday of gravitational waves. Steven Senne AP

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February 11, 2016 5:02 PM

Physicists detect gravitational waves from violent black-hole merger

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