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

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

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.

A team of researchers proposes a new vision of the Universe's first moments. Their model eliminates the need for traditional speculative hypotheses. Cosmologists have long worked with the inflation ...

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 ...

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, ...

The Boötes Void is one of the most mysterious places ever discovered in space. Spanning hundreds of millions of light-years, it contains almost nothing. No galaxies, no stars, and almost no matter at ...