. . . . . . . . . . . . . . . "Enabling the Space Exploration Initiative NASA's exploration technology program in space power"@en . "Enabling the Space Exploration Initiative : NASA's exploration technology program in space power"@en . . . "Enabling the Space Exploration Initiative : NASA's Exploration Technology Program in space power"@en . . . . . . . "Outer space" . . "Mars Observer." . . "United States. Office of Aeronautics and Exploration Technology." . . . .