Ancient star may prove supernova-cosmic ray link

 作者:揭剥仞     |      日期:2019-03-14 05:15:05
A star that died 340,000 years ago has provided fresh evidence that the energetic particles known as cosmic rays are being fired out by supernovae. It is seems likely that a supernova’s shock wave can boost protons to the sort of huge energies found in cosmic rays. Direct evidence for this is hard to find, however,