Earth is currently passing through a cloud of radioactive debris from an ancient supernova. Traces of iron-60, an isotope ...

An international team analyzed data from NASA's Fermi space telescope and detected gamma rays from a rare and exceptionally ...

Cosmic rays seen at Earth show a wide range of particle energies, from 107 electron-volts (eV) to more than 1020 eV, the latter being about the same as the kinetic energy of a 450 gram football ...

Cosmic rays raining down from exploded stars and variations in the Sun's magnetic activity can affect climate on Earth, claims a study. These high-energ ...

Through the years since it was first launched, the Hubble Space Telescope has captured stunning photographs of the Cassiopeia A.