Snapshots from Atlas 5 launch

The two Geosynchronous Space Situational Awareness Program, or GSSAP, satellites for the U.S. military are mounted aboard the United Launch Alliance Delta 4 rocket. Liftoff is planned for Aug. 19 from Cape Canaveral.

After a successful mission that pushed the limits of small satellite technology, ground controllers have lost contact with two briefcase-sized CubeSats beyond Mars, NASA said Tuesday.

Watch the briefing to learn what is aboard the Orbital ATK Cygnus OA-6 resupply freighter launching to the International Space Station on March 22 aboard a United Launch Alliance Atlas-5 rocket.