Washington, UNITED STATES
Dr. David Reitze shows the merging of two black holes at a news conference to discuss the detection of...
Dr. David Reitze, Executive Director of the LIGO Laboratory at Caltech, shows the merging of two black holes at a news conference to discuss the detection of gravitational waves, ripples in space and time hypothesized by physicist Albert Einstein a century ago, in Washington February 11, 2016. The waves were detected by twin Laser Interferometer Gravitational-wave detectors (LIGO) in Louisiana and Washington states in September 2015. REUTERS/Gary Cameron