Published on Apr 4, 2013
The first results from the Alpha Magnetic Spectrometer aboard the International Space Station were discussed during a Press Briefing at NASA Headquarters. Those results confirm an unexplained excess of high-energy positrons in Earth-bound cosmic rays. Antimatter is rare in the universe today. Because Earth receives a limited amount of energetic antimatter, antiparticles serve as unique messengers of high-energy phenomena in the cosmos, or signatures of exotic new physics.