Scientists Discover an Invisible Shield Protecting Earth  

December 3, 2014 12:21 AM

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Scientists Discover an Invisible Shield Protecting Earth  

Scientists led by a team at the University of Colorado in Boulder have discovered an invisible shield some 7,200 miles above Earth, which they say protects the planet from “killer electrons”—ominous-sounding particles that whip around space close to the speed of light, fry satellite equipment and even harm astronauts outside space stations.

The shield was discovered in the Van Allen radiation belts, a couple of doughnut-shaped rings held in place above Earth by its magnetic field. First discovered in 1958 by Professor James Van Allen at the University of Iowa, the belts are filled with electrons and protons that respond to incoming “en...

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