The LIGO and Virgo gravitational wave detectors are back on
Improved instruments could spot more colliding black holes or even new phenomena
![Virgo mirror](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2019/04/032819_EC_grav-wave_feat.jpg?fit=860%2C460&ssl=1)
MIRROR, MIRROR The search for gravitational waves is back on, after improvements to detectors’ mirrors (one mirror from the Virgo detector, shown) and other components.
M. Perciballi/EGO & Virgo Collaboration