If matter and antimatter had come out of the Big Bang in equal amounts, there would be no stars today. Every particle has an antimatter twin with the opposite electric charge, and when the two meet, both vanish in a burst of energy. A perfect balance would have left a universe of pure light, with […]

In a lab at the Okinawa Institute of Science and Technology (OIST) in Japan, a slab of diamond smaller than a pencil eraser hangs from a carbon fiber rod about 5 centimeters (2 inches) long. The rod is attached to a graphite plate that floats in mid-air above four magnets. Nobody touches it. When a […]

Physicists have been asking an awkward question for decades. If the universe is built from invisible fields, why has each one ended up in the state we find it in, and not in some other? A team at the University of Portsmouth, working with colleagues at Syracuse University and the École Normale Supérieure in Paris, […]

Quarks, the smallest known building blocks of matter, are never seen alone. They are roughly a billion times smaller than an atom and exist only locked inside larger particles such as protons and neutrons — no one has ever observed one in isolation. That impossibility has a name, confinement, and a strange consequence: try to […]

Somewhere between an electron and a human being, the rules of physics change. Quantum mechanics allows an atom to exist in two states simultaneously — spinning left and right at the same time, for instance — which is impossible to picture at human scale. Nobody has ever seen a person, or even a speck of […]

On October 9, 2022, two space telescopes, Swift and Fermi, picked up the brightest gamma-ray burst ever recorded. Researchers nicknamed it BOAT — “brightest of all time” — official designation GRB 221009A. The explosion happened in a galaxy roughly 2 billion light-years away, which means its light set out across space before complex life had […]

The world’s most sensitive dark matter observatory, the LUX-ZEPLIN (LZ) experiment, has detected a particle interaction that cannot be explained by conventional background radiation models, a finding that, although still far from being confirmed as a definitive discovery, has sparked cautious optimism in the international scientific community. The event, recorded nearly a mile underground at […]

Researchers at the Niels Bohr Institute, at the University of Copenhagen, have managed to reproduce in the laboratory the state of matter that filled the cosmos during its first millionth of a second after the Big Bang, using collisions between atomic nuclei much lighter than what was previously thought possible. This breakthrough, which the scientists […]