While solitary black holes should be common, they are hard to find. The one in Sagittarius revealed itself when it passed in front of a dim background star, magnifying the star’s light and ...

A distant star is being eaten by its companion, but it is getting ready to take its revenge. The pair make up the most massive contact binary – two stars that are so close together they are ...

The bright star in background is its pulsar ... the unique object—again, either one of the heaviest neutron stars or possibly the lightest-known black hole—formed in a merger between two ...

Astronomers at the University of Hawaii uncovered black hole events so packed with energy, they were the biggest explosions seen since the Big Bang.

The center of the Milky Way is a messy place, full of stars and star remnants. There's so much going on that it's hard to observe in visible light, so precision measurements rely on radio, X-ray ...

Most of the time, the engulfing partner dies before its core is consumed, leading to two compact objects like white dwarfs, neutron stars or black holes orbiting one another. The final stages of ...

"A more equal-mass binary would be great, one closer even better," Berry said. And pinning down the fuzzy realm between neutron star and black hole isn't important just for precision's sake ...