Racing across the universe for the last 7.3 billion years, two gamma-ray photons arrived at NASA’s orbiting Fermi Gamma-ray Space Telescope within nine-tenths of a second of one another. The dead-heat ...

The universe has no shortage of mysteries, many of which have puzzled us for ages. One of the biggest is the existence of ...

Astronomers have performed very long baseline interferometry (VLBI) observations of a gamma-ray loud blazar known as TXS 2013+370. The observations, posted November 19 on the arXiv preprint server, ...

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Physicists have demonstrated with unprecedented accuracy that the speed of light remains constant. In 1887, a landmark physics experiment was carried out by American researchers Michelson and Morley.

A team of astronomers say they've made the first ever detection of dark matter by examining gamma rays near the center of the Milky Way.

Nearly a century after astronomers first proposed dark matter to explain the strange motions of galaxies, scientists may finally be catching a glimpse of it. A University of Tokyo researcher analyzing ...

A scientist analyzing Fermi telescope data found a strange glow around the Milky Way that looks like it could be coming from ...

Schematics of the all-optical nonlinear Compton scattering experiment showing laser-driven electron acceleration, electron-laser collision, and Compton scattering to produce gamma rays. In a ...

The breakthrough could make scans sharper, faster, cheaper, and safer — expanding access to high-quality nuclear medicine imaging for patients worldwide. Physicians rely on nuclear medicine scans, ...