Gravitational waves

A mathematical shortcut for analyzing black hole collisions works even in cases where it shouldn’t. As astronomers use it to search for new classes of hidden black holes, others wonder: Why?

One black hole is nice, but astrophysicists can do a lot more science with 50 of them.

Once missing in action, middleweight black holes have finally been detected. Now researchers are trying to figure out how they grow from small ones.

Subtle aberrations in the clockwork blinking of stars could become “the result of the century.” That’s if the distortions are produced by a network of giant filaments left over from the birth of the universe.

It was an old idea of Stephen Hawking’s: Unseen “primordial” black holes might be the hidden dark matter. A new series of studies has shown how the theory can work.

New calculations show how hypothetical particles called gravitons would give rise to a special kind of noise.

Sometimes a mirror that reflects 99.9999% of light isn’t good enough.

A recent neutron star merger has defied astronomers’ expectations, leading them to question longstanding ideas about neutron stars and the supernovas that create them. “We have to go back to the drawing board.”

Researchers have confirmed rumors of a black hole collision that challenges our ideas about how black holes form.