Astrophysics

Astronomers found two colliding galaxies dating back to less than 500 million years after the big bang

The disk of our galaxy was long thought to produce these ghostly high-energy particles, but they haven’t been detected until now

Astrophysicists are tuning in to a never-before-seen type of gravitational wave spawned by pairs of supermassive black holes

Astrophysicist Farhad Yusef-Zadeh has spent decades peering into the center of the Milky Way galaxy, discovering hundreds of enigmatic filaments in the process

Particle by particle, all matter may eventually disappear, according to new calculations

Researchers still hope to discover hundreds of new binary black hole mergers despite technical setbacks that have sidelined key detectors in Italy and Japan

After years of downtime for upgrades, the world’s premier gravitational-wave observatories are coming back online with big hopes for transformative discoveries

For at least three years, the mysterious blast has shined 10 times brighter than any supernova

Two SciAm editors duke it out to see if wormholes and multiverses could in fact exist.

Laser-based optical frequency combs, originally developed to time atomic clocks, can also perform fast, noninvasive tests for COVID—and potentially other diseases as well

A dying star swallowing a giant planet hints at the fate awaiting our solar system some five billion years from now

The laws of physics allow time travel. So why haven’t people become chronological hoppers?