Virgin Group's Founder billionaire Richard Branson (C) and Burt Rutan, president of Scaled Composites, take questions from the media after the public roll-out of Virgin Galactic's mothership WhiteKnightTwo in Mojave, California on July 28, 2008. The twin fuselage aircraft WhiteKnightTwo will carry SpaceShipTwo to launch commercial passengers into space. Looking on at left is Stephen Attenborough, head of Astronaut Relations. (UPI Photo/Jim Ruymen)