The massive black hole has been dubbed GW231123. Its unusual size and behavior is challenging scientists' understanding of ...

Two colossal black holes among the most massive ever seen collided in deep space, creating gravitational waves that rippled ...

“It’s the most massive [merger] so far,” says Mark Hannam, a physicist at Cardiff University, UK, and part of the LVK ...

A gravitational wave has revealed the biggest black-hole merger ever recorded—so massive and extreme, it defies current astrophysical models. The clash formed a 225-solar-mass monster, possibly made ...

Gravitational-wave detectors have captured their biggest spectacle yet: two gargantuan, rapidly spinning black holes likely ...