Watch live: NASA holds briefing on antimatter-hunting experiment

NASA officials unveil the first results of the Alpha Magnetic Spectrometer experiment. AMS is cosmic-ray detector designed to seek out signs of antimatter and elusive dark matter from its perch on the International Space Station.

Watch live, broadcast via NBC News on April 3.

[Photo of Mark Kelly, who commanded the mission to deliver the Alpha Magnetic Spectrometer and an ExPRESS Logistics Carrier to the International Space Station, via Flickr user Ben_Cooper, used under a creative commons license]