Astrophysics

At long last, the definitive discovery completes a trifecta of astrophysical events that were forecast by gravitational-wave astronomers

Circumstantial evidence could point to a mind-blowing solution to an antimatter mystery—or to the need for better space-based particle physics experiments

If such an object a mere 1,000 times bigger than an atom passed through your body, the result would not be pretty

New radio-based observatories could soon detect ultrahigh-energy neutrinos, opening a new window on extreme cosmic physics

Images from the Event Horizon Telescope reveal new details of how supermassive black holes produce huge jets of matter and energy

Recent results from a pulsar timing array, which uses dead stars to hunt for gravitational waves, has scientists speculating about cosmic strings and primordial black holes

Physicists have new ideas about why the energy of empty space is so much weaker than it is predicted to be

Large galaxies are thought to form gradually, across billions of years of cosmic time. So why do astronomers keep finding them in the youthful early universe?

A new analysis of light and gravitational waves from colliding neutron stars helps reveal what’s inside these ultradense objects

Astrophysicists now have enough black-hole mergers to map their frequency over the cosmos’s history

Physicists describe a way to merge quantum theory with Einstein’s special theory of relativity—and even a method to test it experimentally

Half the award goes to Roger Penrose, with the rest split between Reinhard Genzel and Andrea Ghez, for work revealing the “darkest secrets of the universe”