For decades, scientists have been trying to solve a mystery: Where do high-energy cosmic rays come from? These charged particles travel from outer space to Earth, but their origins remain unknown. Now ...

A dead star accelerates protons to extreme speeds, shedding light on the origin of the most energetic cosmic rays.

For the first time, scientists have caught lightning in the act of unleashing a powerful burst of gamma radiation known as a terrestrial gamma-ray flash (TGF). Researchers at the University of Osaka ...

Using various telescopes, an international team of astronomers has performed multi-wavelength observations of a recently ...

Watch an animation of a black hole shooting jets of particles through a "collapsing star at nearly the speed of light" and emit "x-rays and gamma rays (magenta)," according to NASA's Goddard Space ...

An X8.2 class solar flare flashes in the edge of the Sun on Sept. 10, 2017. This image was captured by NASA's Solar Dynamics Observatory and shows a blend of light from the 171 and 304 angstrom ...

Solar physicists say they have found a key source of intense gamma rays unleashed when Earth's nearest star produces its most violent eruptions. In findings published in Nature Astronomy, scientists ...