Astronomers have spotted the most powerful gamma ray burst to date, a titanic explosion that emitted radiation a trillion times more energetic than visible light.
The LIGO and Virgo gravity wave observatories, recently upgraded to improve sensitivity, have detected five black hole and neutron star mergers in a single month.
Detailed analysis of gravitational wave data collected last year indicating the merger of two neutron stars shows the result was a single massive neutron star, not a black hole.
Astronomers have found an “ultra-stripped supernova” that created a second neutron star in a tight binary system, matching theoretical predictions for how such binaries are formed in otherwise disruptive blasts.