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 […]
About 7.4 light-years from the Sun, a dim ball of gas about as wide as Jupiter drifts through space with no star to warm it. Jupiter is large enough to fit some 11 Earths side by side. (A light-year is the distance light travels in a year, nearly 6 trillion miles.) That puts the object […]
For more than three centuries, astronomers asking whether the Solar System is stable have received ever more comforting answers. Isaac Newton was not so sure. He suspected that the mutual tugs between Jupiter and Saturn would eventually wreck the planetary order, and that only divine intervention could prevent it. By the late 1700s, Laplace and […]
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, […]
Long ago, the patch of sky that would become our galactic neighbourhood looked nothing like a galaxy. It was a collection of thousands of smaller galaxies. Some were turning out stars at a frantic pace, others held nothing but gas, and others were littered with dead stars and black holes. That is the picture drawn […]
In April 2009, newspapers around the world ran a headline that read like a cocktail menu: the center of the galaxy tastes of raspberries and smells of rum. The line came from the Guardian, which built it from a press release by the Max Planck Institute for Radio Astronomy in Bonn. The release was much […]
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 […]
An international team of astronomers has published a detailed study of VT J1906+0849, a radio source discovered in the VLASS survey (Very Large Array Sky Survey) that doesn’t resemble anything else previously catalogued in the Milky Way. The paper, led by Jessie M. Miller of the California Institute of Technology, combines radio, infrared, optical, and […]
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 […]
There’s a temperature nothing in the universe has ever touched. It’s called absolute zero, equal to -273.15°C (-459.67°F), the point at which the particles that make up matter would lose all their kinetic energy and simply stop moving. In 1848, the British physicist William Thomson — better known as Lord Kelvin — proposed making that […]
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 […]
For the first time, astronomers have pointed NASA’s two flagship space telescopes at the same patch of sky beyond Neptune and let them work as a team. Hubble handled the visible light. Webb handled the infrared. Together, they picked out 27 previously unknown trans-Neptunian objects, or TNOs — small, icy bodies that drift in the […]
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 […]
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