Scientists are testing a novel way to measure cosmic expansion using time delays in gravitationally lensed quasars. Their ...

X-ray space telescopes caught a supermassive blackhole flinging matter into space at a fifth of the speed of light.

The universe is expanding, but astronomers still cannot agree on exactly how fast. That mismatch, known as the Hubble tension ...

Intermediate mass black holes (IMBH), if they exist, have between about 100 and 1,000 solar masses, placing them in between ...