3. National Aeronautics and Space Administration, The Vision for Space Exploration: February 2004, National Aeronautics and Space Administration, Washington, D.C., 2004.

4. President’s Commission on Implementation of United States Space Exploration Policy, A Journey to Inspire, Innovate, and Discover, U.S. Government Printing Office, Washington, D.C., 2004.

5. See, for example, National Research Council, Scientific Prerequisites for the Human Exploration of Space, National Academy Press, Washington, D.C., 1993, pp. 3 and 17–24.

6. See, for example, National Research Council, Solar and Space Physics and Its Role in Space Exploration, The National Academies Press, Washington, D.C., 2004.

7. See, for example, “Subsatellite Missions,” section 2.5 of Enabling Exploration with Small Radioisotope Power Systems, R.D. Ableson, ed., JPL Publication 04-10, Jet Propulsion Laboratory, Pasadena, Calif., 2004.



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