One of the most fundamental and curious mysteries in the universe is the fact that anything exists at all. That is because ...

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

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

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 ...

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

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

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, ...

Cosmologists are quietly confronting a possibility that would have sounded absurd a generation ago: the standard picture of a smooth, empty vacuum may be wrong unless space itself behaves like a ...

The catastrophic collision of a black hole and a neutron star sent ripples across the universe. New analysis of those ripples could upend a major theory about how these extreme pairs form. When you ...

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 ...