Two U.S. Air Force cargo planes delivered the Mars 2020 rover, cruise stage, descent module and the Mars Helicopter to the Kennedy Space Center in Florida this week for final assembly, fueling and mounting atop a United Launch Alliance Atlas 5 rocket in preparation for liftoff in July.

Take a walk around NASA’s OSIRIS-REx spacecraft less than three weeks before its Sept. 8 launch on top of an Atlas 5 rocket. Rich Kuhns, the mission’s program manager from Lockheed Martin, points out some of the major features on the probe.

SpaceX’s Falcon 9 rocket disintegrated shortly after launch from Cape Canaveral on Sunday, dealing a blow to the entrepreneurial space company and NASA’s supply chain to the International Space Station.