Gravitational-Wave Detector Resumes Hunt for Space-Time Ripples

The experiment that made the first direct detection of gravitational waves is once again hunting for these space-time ripples. The Laser Interferometer Gravitational-wave Observatory (LIGO) stopped collecting data in January for a scheduled period of upgrades to its two detectors, located in Hanford, Washington, and Livingston, Louisiana. The LIGO collaboration announced the first direct detection of gravitational waves in February 2016 and announced a second detection in June.