Cosmic rays are particles from outer space that travel across the universe. They can be made by the sun, by other stars exploding, and even black holes. They move extremely fast, nearly the speed of ...

A massive burst of gamma rays produced by the explosion of a star almost two billion light-years away was so powerful that it changed Earth’s atmosphere, according to scientists. Gamma rays are ...

The observations are typically made in visible light or infrared, but a new paper suggests X-rays may be useful, too. Stellar ...

Just 41 light-years distant in the constellation of Cancer, Janssen (also called 55 Cancri e) is presently the best evidence to date for an atmosphere around a terrestrial, rocky planet outside ...