A team of scientists led by the University of Colorado Boulder has discovered an invisible “Star Trek”-style shield that blocks so-called “killer electrons” 7,200 miles above Earth.

The electrons, which travel at near light-speed, are capable of damaging space electronics and can put astronauts in danger.

The shield, which forms a barrier to particle motion, was found in the Van Allen radiation belts, according to Distinguished Professor Daniel Baker, director of CU-Boulder’s Laboratory for Atmospheric and Space Physics, who led the study. The radiation belts, which are held in place by Earth’s magnetic field, are two doughnut-shaped rings that are packed with high-energy electrons and protons.

“It’s almost like these electrons are running into a glass wall in space,” said Baker, in a statement. “Somewhat like the shields created by force fields on Star Trek that were used to repel alien weapons, we are seeing an invisible shield blocking these electrons. It’s an extremely puzzling phenomenon.”

The scientists discovered an “extremely sharp” boundary at the inner edge of the outer radiation belt, which appears to block electrons from breaking through the shield and moving towards Earth’s atmospher ...