Science ❯ Astrophysics ❯ Cosmology

Cosmic Events

Black Hole Mergers Black Hole Formation Fast X-Ray Transients Neutron Star Collisions Black Hole Collisions InterPlanetary Network Stellar Interactions Kilonovae Time Dilation Gamma Ray Bursts

Twin Black-Hole Mergers Display Extreme Spins, Strengthen Einstein’s Theory, and Point to Second-Generation Origins

Peer-reviewed analyses turn two late-2024 gravitational-wave detections into some of the sharpest tests of general relativity to date.

Record-Setting Day-Long GRB 250702B Confirmed at z = 1.036 as Origin Remains Unsettled

Record-Breaking 225-Solar-Mass Black Hole Merger Challenges Formation Models