The alerts started in the early morning of Aug. 17. Gravitational waves produced by the wreck of two neutron stars—dense cores of dead stars—had washed over Earth. The thousand-plus physicists of the ...

When a star the size of 20 suns dies, it becomes, in the words of astrophysicist Zaven Arzoumanian, “the most outrageous object that most people have never heard of”—a city-size body of improbable ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Can a quark star exist? It's an open question in the astronomy community, but there appears to be ...

A new particle detector has passed a crucial test that shows it is ready to detect the "ashes" left over from a unique primordial soup that filled the universe immediately after the Big Bang. The ...

Observational first: physicists have used the ATLAS experiment at CERN to observe the production of top-quark and photon pairs. (Courtesy: CERN) For the first time, particle physicists have observed ...

The early Universe was a strange place. The Universe was so dense and hot that atoms and nuclei could not form—they would be ripped apart by high-energy collisions. Even protons and neutrons could not ...