It’s “common knowledge”—and the scare quotes should be a warning—that the sun is an average star.

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

Scientists studying a mysterious effect called cosmic birefringence—a subtle twist in the polarization of the universe’s oldest light—have developed a new way to reduce uncertainty in how it’s ...

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 ...

Dimensions beyond the four we’re familiar with could solve a host of problems in physics and cosmology. Columnist Leah Crane ...

A unique technique allowed astronomers to see the early universe as a "sea of light" and explore the effects of gravity and dark energy on cosmic evolution.

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

Astronomers have uncovered a hidden cosmic web of galaxies and gas by mapping hydrogen light from the early universe.