British billionaire Sir Richard Branson hails 2008 the "year of the spaceship" as he unveils the designs for two aircraft which could help take tourists into space. The countdown is on for the first regular paying citizen passengers to rocket into space. British billionaire Sir Richard Branson, along with aerospace design guru Burt Rutan on Wednesday (January 23) unveiled models of SpaceShipTwo and its accompanying mothership White Knight Two -- caraft which aim to to carry 6 passengers along with 2 pilots into space. The work on these two crafts is nearing completion and flight tests will begin later this year. At the unveiling at the Museum of Natural History in New York, Branson expressed a vision of space travel that seems limitless. He believes private space travel could help to answer key questions about Earth's climate and the mysteries of the universe. "If our new system could carry only people into space, that would be enough for me, because of the transforming effect it...