For years, astronomers have searched for the origins of ultra-high-energy cosmic rays, the most powerful particles in the universe. These energetic travelers move at nearly the speed of light ...

Cosmic rays can come from distant supernovas, black holes and even the sun, and they constantly lash Earth's upper atmosphere. When they splinter as they interact with air molecules, ...

The IceCube neutrino detector has allowed researchers to resolve a debate about what types of particles make up ultra-high-energy cosmic rays – but much remains unknown about these rare events ...

For the first time, international researchers have pinpointed the moment when planets began to form around a star beyond the ...

X-ray image of the newly discovered pulsar wind nebular associated with an extreme Galactic cosmic ray source 1LHAASO J0343+5254u, obtained by the XMM-Newton space telescope (DiKerby, Zhang, et al ...

Data from a South Pole observatory shows that the fraction of protons in ultrahigh-energy cosmic rays is lower than expected.

Cosmic rays are not rays at all. They’re particles, mostly protons or atomic nuclei, that fly through space at nearly the speed of light. Some come from inside our galaxy.

Cosmic radiation occasionally contains enormous amounts of energy, but we don’t know why or where this radiation comes from.

So gamma rays emanating from SNR’s come from speeding protons. Cosmic rays are made of speeding protons. Case closed — or almost, anyway. It’s still circumstantial.

Cosmic rays, which are predominantly high-energy protons and atomic nuclei, traverse the heliosphere—a vast bubble carved by the Sun’s outflowing plasma—before encountering the interstellar ...

Supermassive black holes are some of the most powerful engines in the universe. These giants sit at the centers of galaxies, including your own Milky Way, and sometimes become active by pulling in ...