Orbital Sciences Corp. completes a final cargo load of the Cygnus cargo spacecraft in preparation for launch to the International Space Station on October 23, 2014, at the Horizontal Integration Facility at NASAs Wallops Flight Facility in Virginia, as seen in this handout photo from NASA. An unmanned Antares rocket exploded seconds after liftoff from a commercial launch pad in Virginia on Tuesday, marking the first accident since NASA turned to private operators to deliver cargo to the International Space Station, but officials said no one was hurt. (NASA)