The local universe may be expanding more slowly than previously thought, a discovery that could relieve a pesky discrepancy ...

A novel theory suggests that the current expansion rate of the universe is not fixed, but was in fact quite different in the ...

Cosmic voids may seem like the emptiest places in the universe, stripped of matter, radiation, and even dark matter. But they’re far from nothing. Even in these vast empty regions, the fundamental ...

A team of astronomers from NASA have detected several strange and unexplained "little red dots" that are travelling through ...

Light released by a distant star does not simply wink out after crossing some threshold of space. In a vacuum, photons keep moving indefinitely, and astronomers routinely detect light that has ...

Add Yahoo as a preferred source to see more of our stories on Google. In space, there are four dimensions: length, width, height and time. scaliger/iStock/NASA via Getty Images Plus About a century ...

Observations show the universe appears flat, yet its true size and global shape beyond the observable horizon may remain forever unknown.

"Cosmic archaeologists" have discovered an iron-deficient second-generation star, which provides evidence of how ancient stars enriched their successors.

Wormholes are often imagined as tunnels through space or time—shortcuts across the universe. But this image rests on a misunderstanding of work by physicists Albert Einstein and Nathan Rosen. In 1935, ...

Here’s what you’ll learn when you read this story: A mysterious reddish object that formed only 90 million years after the Big Bang was observed by the James Webb Space Telescope. If it is a galaxy, ...

There’s endless debate among cosmologists about what really makes up the emptiness of outer space, though many believe that mysterious stuff that we now call dark matter and dark energy represent a ...

The James Webb Space Telescope may have discovered Population III stars, the universe's first generation of stars. They may tell us more about how galaxies form. When you purchase through links on our ...