. . . . . . . . "Transitioning to a next generation human space flight system hearing before the Subcommittee on Space, Aeronautics, and Related Sciences of the Committee on Commerce, Science, and Transportation United States Senate, One Hundred Tenth Congress, first session, March 28, 2007"@en . . . . . . . . . . "Transitioning to a next generation human space flight system : hearing before the Subcommittee on Space, Aeronautics, and Related Sciences of the Committee on Commerce, Science, and Transportation United States Senate, One Hundred Tenth Congress, first session, March 28, 2007"@en . . "Outer space" . . . .