Space & Physics

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

Time crystals, a state of matter once thought physically impossible, could soon be on a banknote

Inertial confinement reactors, stellarators and tokamaks each have pros and cons

An abandoned plan to visit another star highlights the perils of billionaire-funded science

Kissing bugs are creeping across the U.S.—and they’re bringing Chagas disease with them.

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

The public can submit names to travel along with four astronauts on an orbital journey to the moon next year

The Perseverance rover’s new findings set the stage for bringing Martian samples back to Earth to test whether microbes once inhabited the Red Planet

Spacetime ripples from a black hole collision across the cosmos have confirmed weird aspects of black hole physics

A monumental sign of an atmosphere on TRAPPIST-1e could be the precursor to finally finding a living world around another star

A sweeping U.S. missile defense program comes with many risks, costs and uncertainties, analysts say

A common nasal spray shows promise in reducing COVID risk, but vaccine access remains tangled in policy in the U.S.