Using data from space telescopes and other instruments, astronomers, cosmologists, and astrophysicists are able to deduce and ...

A never-before-seen image of the cosmic microwave background, combining data from the Atacama Cosmology Telescope (ACT) and ...

A new analysis of the sky has finally confirmed where the missing half of the Universe's visible matter has been hiding.

By mapping the brightest explosions in the universe, scientists may have uncovered a megastructure that defies our ...

Astronomers have confirmed a wandering black hole, about seven times the mass of the Sun, 5,000 light-years from Earth.

Mysterious dark matter makes up 85 percent of matter in the universe, and of the remaining 15 percent, scientists couldn’t ...

In the grand puzzle of the cosmos, one question continues to defy easy answers: how fast is the universe expanding?

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s ...

A slowly spinning universe could resolve a puzzle in physics known as the Hubble tension, a new model suggests.

The halo is more extended that astronomers originally thought, and contains enough hydrogen gas to resolve the problem of the ...