Astronomers believe they've now worked out the details of how supernova remnants can form cosmic rays.
German scientists say they've found a way to tell whether or not our universe is a giant computer simulation - and that there's evidence to suggest that it is.
Gamma ray bursts turn out not to be the cause of the strongest cosmic rays, leaving scientists scratching their heads.
Move over CERN: a pattern of X-ray 'stripes' in the remains of a supernova may provide the first direct evidence that supernovae can accelerate particles to energies a hundred times higher than the Large Ladron Collider.
The 'force field' shielding our solar system from cosmic rays has declined in intensity by 10 to 15 percent over the last six months.