Mysterious dark matter makes up 85 percent of matter in the universe, and of the remaining 15 percent, scientists couldn’t account for half—until now.

A tiny but radical twist in the fabric of the cosmos could offer a breakthrough in one of astronomy’s most persistent ...

A faint cosmic spin – one rotation per 500 billion years – could resolve the stubborn Hubble tension by tweaking standard ...

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

Astronomers may have found the long-missing half of the universe's regular matter—and it appears to have been right under our ...

Richard Howard Where's the coldest spot in the universe? Not on the moon ... Not even in deepest outer space, which has an estimated background temperature of about minus 455°F.

Cosmic microwave background data support cosmology’s standard model but retain a mystery about the universe’s expansion rate.

A new analysis of astronomical data suggests unknown physics is at work assisting dark energy in acting almost as "antigravity," undoing the work of gravity, which clumps together matter to build vast ...

Not everything we knew about the universe is wrong. But not not everything. The Dark Energy Spectroscopic Instrument (DESI) ...

The cooled remnant of the first light that permeated the universe is known as the cosmic microwave background—leftover radiation from the Big Bang that can still be detected in the distant universe.

Current models suggest the universe is expanding evenly in all ... Studies of the Cosmic Radiation Background—the echo of the first light from the Big Bang—gives one result, while measurements ...

Experts have unveiled the most detailed images yet of the universe’s infancy, capturing light that traveled for more than 13 ...