LIGO Gravitational-Wave Observatory Back Online --Upgraded Ability to "See" Previously Undetected Black Hole and Neutron-Star Events Farther Out in the Universe

Scientists have restarted the twin detectors of LIGO, the Laser Interferometer Gravitational-wave Observatory, after making several improvements to the system. Over 2017, they have made enhancements to LIGO's lasers, electronics, and optics that have increased the observatory's sensitivity by 10...