The bold question-askers at What If imagine the cosmic consequences of a collision between a black hole and a white hole.

Gravitational waves stretch and squeeze the fabric of space and time itself. When space/time is squeezed, pulsar pulses ...

These black holes are the most distant and stable objects we know. Using a technique called very long baseline interferometry ...

"This work is a step toward understanding how quantum mechanics and gravity work together, a major unsolved problem in ...

This black hole merger animation was created using data collected by the LIGO and Virgo gravitational wave detectors, an ...

Supermassive black holes usually lurk unseen, but when an unlucky star drifts too close they ignite titanic outbursts ...