The United Launch Alliance Atlas V rocket carrying NASA's Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer (OSIRIS-REx) spacecraft lifts off Thursday, Sept. 8, 2016 at Cape Canaveral Air Force Station in Florida. OSIRIS-REx will be the first U.S. mission to sample an asteroid, and will retrieve at least two ounces of surface material and return to Earth for its study. The asteroid, Bennu, may hold clues to the origin of the solar system and the source of water and organic molecules found on Earth.