Cosmology

When space itself expands, weird things can happen—like galaxies breaking the universe’s ultimate speed limit

Gauging the mass of a black hole is tricky, but astronomers have devised multiple methods to measure the heft of these galactic gluttons

A swarm of galaxies called the Bullet Cluster is the biggest, best natural laboratory for studying dark matter that astronomers have ever seen

The universe has a habit of disproving “unassailable” facts

This telescope has revealed the whipped-up dust from the birth of a star—and a shining background galaxy—more clearly than ever before

JWST observations of light sources before the first galaxies should have formed are raising new questions about our galactic origins

Scientists are uncovering how spinning black holes launch jets, warp spacetime and shape the cosmos

Researchers hoped CMB-S4, a $900-million cosmology experiment, would answer one of the greatest questions in physics. Instead it’s become another cautionary tale of pursuing big science amid shrinking budgets

The LHCb experiment has observed a new difference between matter and antimatter in particles called baryons

Inspired by superconductivity, a strange new theory that seeks to explain dark matter might explain dark energy, too

The most anticipated particle physics result of recent years is here—but the real news came one week before: the “muon g–2 anomaly” might have never existed

Scientists are rallying to reverse ruinous proposed cuts to both NASA and the National Science Foundation