A small black hole is helping scientists understand how mysterious cosmic rays can barrel through the Universe and hit Earth at nearly the speed of light.
Scientists in Utah have detected the second-most energetic cosmic ray ever seen. The powerful particle rivals the highest-energy cosmic ray on record, called the Oh-My-God particle, which was spotted in 1991.
Ultra-high-energy cosmic rays that occasionally hit the Earth may be coming from a distant source outside the Milky Way galaxy, a study suggests.
The X-ray emissions were discovered by chance beyond the Milky Way and no one really knows what is causing them.
Most of the cosmic rays that we detect at Earth originated relatively recently in nearby clusters of massive stars, according to new results from NASA's Advanced Composition Explorer (ACE) spacecraft.
Alien rays from outer space, which pass through our bodies every second of every day, have been traced to their source – a super-massive black hole that lies at the heart of our home galaxy, the Milky Way, German and Australian scientists have discovered.
