Earth’s atmosphere offers us more than breathable air: it’s humanity’s security blanket, filtering a steady barrage of cosmic radiation from space. 

These cosmic “rays” are actually atomic nuclei, and they rain in from supernovae and distant galaxies at speeds of up to 667,934,162 mph (99.6% the speed of light)! 

If the atmosphere offers us ground-dwellers protection from all these space particles, are high-elevation dwellers subjected to more potent cosmic radiation?