Cosmic rays are tiny bits of atoms racing by us — and even sailing right through our bodies — all the time. Physicists can’t figure out where they came from, but they have some wild hypotheses: | Vox

36K views · 13 reactions | Why are cosmic rays high energy particles? Highly energetic particles from outer space travelling at the speed of light, known as cosmic rays, originate from the sites of extreme particle acceleration in the Universe. This lecture considers just how energetic these rapid particles are, the origins of their extreme energies and the implications for Earth. Watch Now #Astronomy #Astrophysics | Gresham College | Facebook