text: NASA chief Sean O #39;Keefe quits Washington: NASA Administrator Sean O #39;Keefe has resigned, spending three turbulent years at the helm of the US space agency which saw the crash of Columbia space shuttle, a painful probe into the disaster and severe austerity measures.
inputs: NASA chief Sean O #39;Keefe quits Washington: NASA Administrator Sean O #39;Keefe has resigned, spending three turbulent years at the helm of the US space agency which saw the crash of Columbia space shuttle, a painful probe into the disaster and severe austerity measures.