Karl Gebhardt explains the two leading ideas for what dark energy might be. Locked in a cosmic tug of war, dark energy (purple) pushes the universe apart, while gravity (green) pulls it together. At ...

The black hole inside a neighboring galaxy, known as M87, is obese and filled with the equivalent of 6.6 billion of our suns, according to new measurements. These supermassive black holes are ...

SEATTLE -- The black hole in the nearby galaxy M87 weighs in at 6.6 billion suns, making it the local universe's heavyweight champ. "This is the biggest black hole in the nearby universe," said ...

Scientists say they've found a massive black hole about 60 million light years away from Earth, a monumental discovery with huge implications for future observation. That's mostly due to the black ...

AUSTIN, Texas — It's the blurry photo taking over social media and news outlets: The first picture of what a real black hole looks like, released by the National Science Foundation (NSF). Up until now ...

New research suggests a massive black hole is the primary force preventing Segue 1's small complement of stars from drifting into the void.

Dark energy is a mysterious force that astronomers haven’t detected, don’t understand and can explain only in the vaguest terms as the reason for the universe’s expansion. Even Karl Gebhardt, one of ...

At more than six trillion times the mass of the sun, nearby galaxy M87 is the most massive galaxy in the local universe. Using the Gemini North telescope, which sits on top of Mauna Kea in Hawaii, ...

A panel of physicists and astronomers grapple with possible cracks in our modern creation myth, the standard model of cosmology. JWST’s image of spiral galaxy NGC 628, which is 32 million light-years ...