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

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 ...

Light released by a distant star does not simply wink out after crossing some threshold of space. In a vacuum, photons keep ...

"Discoveries like this are cosmic archaeology, uncovering rare stellar fossils that preserve the fingerprints of the universe ...

Ripples in the fabric of space-time called gravitational waves may be the key to solving the Hubble tension — one of the ...

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

Now physicists from the University of Washington are taking a big swing at answering that question. All matter exerts gravitational force. The more mass the object has, the greater the force. Yet, 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, ...

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 Boötes Void is one of the most mysterious places ever discovered in space. Spanning hundreds of millions of light-years, ...