In a discovery that could change how we understand the universe, a team of astronomers led by Yale’s Pieter van Dokkum has ...

"It was something I’ve never seen before and I’ve looked at tens of thousands of images of galaxies over my career," he said.

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 ...