LIGO and Virgo’s gravitational wave tally more than quadrupled in six months
Scientists have now collected 50 sets of the spacetime tremors

Scientists have now detected 50 sets of gravitational waves, many produced when two black holes (illustrated) spiral around one another before colliding and merging into one.
© N. Fischer, S. Ossokine, H. Pfeiffer, A. Buonanno/Max Planck Institute for Gravitational Physics, Simulating eXtreme Spacetimes (SXS) Collaboration