An international team involving Northwestern University​ announced Tuesday that it has reached a major milestone in its quest ...

The first time I heard about galaxies without dark matter, I was sitting in my very first graduate class at the University of ...

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

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 ...

Astronomers working with NASA’s James Webb Space Telescope have produced the sharpest wide-area map of dark matter ever ...

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 ...

Dark matter makes up most of the mass in galaxies and galaxy clusters. In fact, scientists estimate that ordinary matter makes up only about 5% of the universe, while dark matter makes up about 27%.

The vast majority of the astronomy world has spent the past century studying the "cosmic concrete" that holds our galaxy and ...

A new high-resolution map of distant galaxies may help scientists understand a mysterious invisible substance that helps hold the universe together. The ordinary matter all around us — stars, planets ...