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

Scientists discuss the impact of cosmic rays and their potential involvement in one of the most significant extinction periods. #HowTheUniverseWorks Watch full episodes on discovery : https://bit.ly/3HfHr6e | Love Science