Virgin Galactic's SpaceShipTwo

An artist's conception of Virgin Galactic's SpaceShipTwo (vehicle in bottom of image) as it is released from its mothership WhiteknightTwo is pictured in this undated handout photograph from Virgin Galactic.

Scaled Composites and Virgin Galactic are set to unveil SpaceShipTwo on December 7, 2009 at the Mojave Spaceport in Mojave, California. The six-passenger vehicle will undergo test flights in 2010 and start commercial flights between 2011 and 2012. REUTERS/Courtesy Virgin