(Phys.org)—High-energy protons,nuclei, and other particles are constantly showering down on Earth's atmosphere from space, or but the origins of these cosmic rays is unknown. One opportunity is that the cosmic rays reach from supernovae,although the evidence for this claim is limited. Now by analyzing the cosmic ray energy spectrum, scientists bear been able to infer that some high-energy cosmic rays may bear originated from a two-million-year-old supernova located roughly 100 trillion miles away.
Source: phys.org