Black holes

Black holes are dead stars that, after exploding as supernovae, have so much mass that nothing can hold them together, causing them to collapse into a singularity.

Five years ago scientists proposed the hypothetical existence of a large world tens of millions of miles from the Sun, which has come to be known as "Planet Nine."

"Simulations and movies like these really help us visualize what Einstein meant when he said that gravity warps the fabric of space and time," the creator of the images said.

The star, named J0740+6620, has a mass more than two times that of our sun, but is just 18 miles wide.

Astronomers found a "runaway star," dubbed PG 1610+062, in the outer halo of the Milky Way.

Researchers detected gravitational waves—ripples in space-time—emanating from a cataclysmic event around 900 million light years away.

IceCube searches for neutrinos—invisible, nearly massless subatomic particles which rarely ever interact with normal matter.

The Imaging X-Ray Polarimetry Explorer (IXPE) is a space observatory that's designed to collect X-ray light data from extreme phenomena.

The idea that time can be warped was proposed by Albert Einstein in his pioneering theories of special relativity and general relativity.

The idea of wormholes was predicted by Einstein's theory of general relativity in 1916.

Scientists think that at the heart of nearly every galaxy lies a supermassive black hole (SMBH) with immense gravity.

Researchers say they have detected remnants of a universe that existed before our own.

This is the first time astronomers have directly imaged the brutal phenomenon.

The broadcast will "create a link" between Hawking's presence on Earth, his desire to visit space and his scientific explorations of the universe, his daughter said.

Last year's collision was the first in which scientists could actually see what was happening during and after the collision.

The behemoth gobbles up the equivalent of our sun's mass every two days.

Ancient black holes, dwarf galaxies and invisible halos might unlock the secrets of dark matter.

Competing winds from black holes and stars wrestle to give this galaxy its strange butterfly shape.

It might surprise you.

The black holes surround the supermassive black hole at the center of the Milky Way.

The fundamental laws of physics guarantee that every process that happens "forward in time" can also happen "backwards in time."

Black holes are voracious eaters, but they don't have the nicest table manners.

Marika Taylor, a professor of Theoretical Physics at the University of Southampton, reminisces about her time spent studying under the late Stephen Hawking.

Millions have had their cosmic horizons widened by his best-selling books; and even more, around the world, have been inspired by a unique example of achievement against all the odds.

It's not just about the detectors picking up a signal—scientists also have to realize it's there soon enough to enlist colleagues in the investigation.

A fundamental equation has cracked the evolution of how planets swarm around the sun.

Light from the jets can outshine entire galaxies.

The planets face supernovas, gamma-ray bursts and gravity-disrupting stars in the crowded center of the Milky Way.

Neutrinos and gamma rays may be the "daughter particles" of ultra-high-energy cosmic rays.

The discovery marks the first inactive black hole ever found at the heart of a giant globular star cluster.