An invisible shield has been erected several kilometers above Earth . The University of Colorado Boulder has announced a discovery 7,200 miles above Earth of a protective shield similar to the force fields you might see in `` Star Trek . '' The shield protects what are known as ` ` killer electrons '' Discovery challenges existing theories of how killer electrons are kept at bay .
An invisible shield has been erected several kilometers above Earth . The shield protects what are known as ` ` killer electrons '' Discovery challenges existing theories of how killer electrons are kept at bay .