Star's swansong is a big hit on Earth

时间:2019-03-05 14:08:02166网络整理admin

By Geoff Brumfiel in Washington DC THE origin of cosmic rays, the high-energy particles that bombard the Earth from space, has long been a mystery. But now astronomers have evidence that at least some of these particles are accelerated in the supernova explosions that occur when a star dies. Astronomers have known since 1912 that the Earth is being continually bombarded by highly energetic particles such as protons. Scientists believe that many cosmic rays must come from supernovae inside our Galaxy but have never had proof. Because the particles are charged,