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 ...

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 ...

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

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

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 interactive online map, created using data from NASA's James Webb Space Telescope, details some 800,000 galaxies across a vast cosmic distance. Scrolling and zooming in can take users some 13.5 ...

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

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