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New measurement yields smaller proton radius

Using the first new method in half a century for measuring the size of the proton via electron scattering, the PRad collaboration has produced a new value for the proton's radius in an experiment conducted at the Department of Energy's... Continue Reading →


New measurement of Hubble constant adds to cosmic mystery

New measurements of the rate of expansion of the universe, led by astronomers at the University of California, Davis, add to a growing mystery: Estimates of a fundamental constant made with different methods keep giving different results. "There's a lot... Continue Reading →

The Nobel Prize in Physics 2019

The Nobel Prize in Physics 2019 was awarded "for contributions to our understanding of the evolution of the universe and Earth's place in the cosmos" with one half to James Peebles "for theoretical discoveries in physical cosmology", the other half... Continue Reading →

2,000 Atoms Exist in Two Places at Once in Unprecedented Quantum Experiment

Giant molecules can be in two places at once, thanks to quantum physics. That's something that scientists have long known is theoretically true based on a few facts: Every particle or group of particles in the universe is also a wave... Continue Reading →

What happens when particles don’t collide, but miss, in the world’s largest particle accelerator?

The search narrows for a mysterious form of matter predicted from Einstein's theory of special relativity. After more than a decade of looking, scientists at the world's largest particle collider believe that they are on the verge of finding it. But... Continue Reading →

Most massive neutron star ever detected, almost too massive to exist

Neutron stars -- the compressed remains of massive stars gone supernova -- are the densest "normal" objects in the known universe. (Black holes are technically denser, but far from normal.) Just a single sugar-cube worth of neutron-star material would weigh... Continue Reading →

Physicists mash quantum and gravity and find time, but not as we know it

A University of Queensland-led international team of researchers say they have discovered "a new kind of quantum time order." UQ physicist Dr Magdalena Zych said the discovery arose from an experiment the team designed to bring together elements of the... Continue Reading →

Schrödinger’s cat with 20 qubits

In 1935, the physicist Erwin Schrödinger put forward the thought experiment with the quantum cat, in which the cat is enclosed in a box together with a radioactive sample, a detector and a lethal amount of poison. If the radioactive... Continue Reading →

Neutron-rich matter in heaven and on Earth

Where do neutrons go? The elusive answer to such a seemingly simple question provides fundamental new insights into the structure of both atomic nuclei and neutron stars. To place the question in the proper context, consider lead-208, the element’s most... Continue Reading →

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