Most cosmologists believe that these stars were the first large, free-floating structures to illuminate our universe, and ...

A tiny particle that smashed into Earth with a record-shattering energy of 220 petaelectronvolts could be the last scream of ...

LIGO observatory near Richland confirmed Einstein’s theory of relativity, it also has proven one of Hawking’s theorems.

New observations of two black holes merging have confirmed predictions made decades ago by Albert Einstein, Stephen Hawking, ...

For more than a century, physics has been built on two great theories. Einstein's general relativity explains gravity as the ...

A provocative new theory suggests that the Universe may not have begun with a traditional Big Bang, but rather as a “Big Bounce” — the explosive rebound of matter collapsing into a black hole. Led by ...

Stellar black holes are born from the collapse of massive stars at the end of their lives, weighing from 3 to 50 times the mass of the Sun. When a star exhausts its fuel, it explodes in a ...

Gravitational-wave detection technology is poised to make a big leap forward thanks to an instrumentation advance led by physicist Jonathan Richardson of the University of California, Riverside. A ...

Some things we see in space appear to outpace light. Now we are learning to harness these bizarre optical illusions to ...

Gravitational-wave detection technology is poised to make a big leap forward thanks to an instrumentation advance led by ...

They discovered that the Chandra spectrum closely matched what they expected from models of black holes expanding faster than ...

From Einstein's theory of relativity to cutting-edge explorations in quantum mechanics, scientists have proposed various theoretical paths to achieve time travel. Although most remain in the realm of ...