Every time our solar system passes through a spiral arm of the Milky Way, cosmic rays jump by 300%. Physicist Henrik Svensmark explains how stars are born in t

Every time our solar system passes through a spiral arm of the Milky Way, cosmic rays jump by 300%. Physicist Henrik Svensmark explains how stars are born in those arms, and what happens to Earth when the biggest ones explode: [▻](https://video.twimg.com/amplify_video/2085443920075366400/vid/avc1…