OpinionMay 22, 2023
Six Gravitational-Wave Breakthroughs Scientists Can’t Wait to See
After years of downtime for upgrades, the world’s premier gravitational-wave observatories are coming back online with big hopes for transformative discoveries
Relativity
Quantum PhysicsMay 22, 2023
Quantum Theory’s ‘Measurement Problem’ May Be a Poison Pill for Objective Reality
Solving a notorious quantum quandary could require abandoning some of science’s most cherished assumptions about the physical world
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Black HolesApril 13, 2023
See the Sharp New Image of an Iconic Black Hole
Using machine learning, researchers have now created a much sharper portrait of the supermassive black hole at the center of the galaxy M87
OpinionApril 5, 2023
Dark Matter Hunters Need Fresh Answers
The hunt for dark matter is in crisis, and it’s time for radical new ideas to explain our universe
Quantum PhysicsDecember 19, 2022
6 Times Quantum Physics Blew Our Minds in 2022
Quantum telepathy, laser-based time crystals, a glow from empty space and an “unreal” universe—these are the most awesome (and awfully hard to understand) results from the subatomic realm we encountered in 2022
Quantum PhysicsOctober 6, 2022
The Universe Is Not Locally Real, and the Physics Nobel Prize Winners Proved It
Elegant experiments with entangled light have laid bare a profound mystery at the heart of reality
AstrophysicsSeptember 15, 2022
Einstein’s Greatest Theory Just Passed Its Most Rigorous Test Yet
The MICROSCOPE mission tested the weak equivalence principle with free-falling objects in a satellite
AstronomyMay 25, 2022
Our Sun Could Someday Reveal the Surfaces of Alien Earths
In the far future, we could reveal detailed views of distant worlds by turning our home star into a gravitational lens
Black HolesFebruary 3, 2022
Astronomers Find First Ever Rogue Black Hole Adrift in the Milky Way
Weighing in at seven times the mass of our sun, the dark object is by far the best-yet candidate for a free-floating stellar-mass black hole
Black HolesJanuary 26, 2022
Could Echoes from Colliding Black Holes Prove Stephen Hawking’s Greatest Prediction?
Subtle signals from black hole mergers might confirm the existence of “Hawking radiation”—and gravitational-wave detectors may have already seen them
Particle PhysicsJanuary 17, 2022
In a First, an ‘Atomic Fountain’ Has Measured the Curvature of Spacetime
The atom interferometry technique uses the effects of time dilation to reveal subtle changes in gravity’s strength
AstrophysicsJanuary 10, 2022
ArXiv.org Reaches a Milestone and a Reckoning
Runaway success and underfunding have led to growing pains for the preprint server