Atmosphere

"Earth’s protective atmosphere has sheltered life for billions of years, creating a haven where evolution produced complex lifeforms like us. The ozone layer plays a critical role in shielding the biosphere from deadly UV radiation. It blocks 99% of the Sun’s powerful UV output. Earth’s magnetosphere also shelters us." https://www.universetoday.com/167427/earths-atmosphere-is-our-best-defence-against-nearby-supernovae/#google_vignette