Ground crews load nitrous oxide into SpaceShipTwo in preparation for an April 12, 2013 test flight. The flight marked the first time that oxidizer flowed through SpaceShipTwo’s rocket nozzle in flight, successfully demonstrating key components of the system, key milestone in advance of SpaceShipTwo’s first rocket powered flight. Photo Credit: Virgin Galactic / Mark Greenberg — at Mojave Air & Space Port. For the first time ever, oxidizer flows through SpaceShipTwo’s rocket nozzle in flight, successfully demonstrating key components of the system. The April 12, 2013 test flight was a key milestone in advance of SpaceShipTwo’s first rocket powered flight....