Astronomers have confirmed the first isolated stellar-mass black hole drifting through the Milky Way, located roughly 5,000 light-years from Earth. The object, designated OGLE-2011-BLG-0462, weighs in ...

A subtle gravitational-wave “hum” from merging black holes may help settle the cosmic fight over how fast the universe is ...

Ripples in the fabric of space-time called gravitational waves may be the key to solving the Hubble tension — one of the biggest nagging problems in physics.

For years, cosmologists have been struggling with the "Hubble tension," a disagreement between measurements of the present-day expansion rate of the universe. One promising solution to this ...

The Hubble Space Telescope's evidence of an "intermediate-sized" black hole about 6000 light-years away in the closest ...

CNN — Astronomers have long studied supermassive black holes and smaller black holes that form when massive stars implode, but they have searched for intermediate-mass black holes for years. Now, ...

Astronomers have long known the universe is expanding—but exactly how fast remains one of the biggest mysteries in cosmology.

Scientists believe the Hubble telescope has, for the first time, detected evidence of a black hole situated between stars in our galaxy. "Until now, all black hole masses have been inferred ...

A Hubble Space Telescope visible-light image of the galaxy MCG-03-34-064. Hubble's sharp view reveals three distinct bright spots embedded in a white ellipse at the galaxy's center (expanded in an ...

Astrophysicists propose a new “stochastic siren” method using the gravitational-wave background from black hole mergers to ...

When the densest objects in the universe collide and merge, the violence sets off ripples, in the form of gravitational waves ...