2. National Research Council, Space Research, Directions for the Future, National Academy of Sciences, Washington, D.C., 1966.

  

3. For a review of NASA’s Mars Exploration Program at this point in its development see, for example, National Research Council, Review of NASA’s Planned Mars Program, National Academy Press, Washington, D.C., 1996.

  

4. For a review of NASA’s Mars Exploration Program at this point in its development see, for example, National Research Council, Assessment of NASA’s Mars Exploration Architecture, National Academy Press, Washington, D.C., 1998.

  

5. For a review of NASA’s Mars Exploration Program at this point in its development see, for example, National Research Council, Assessment of Mars Science and Mission Priorities, The National Academies Press, Washington, D.C., 2003.

  

6. S.W. Squyres et al., “The Spirit Rover’s Athena Science Investigation at Gusev Crater Planum, Mars,” Science 305: 794-799, 2004. Also see subsequent papers (pp. 800-845) in this issue of Science.

  

7. S.W. Squyres et al., “The Opportunity Rover’s Athena Science Investigation at Meridiani Planum, Mars,” Science 306: 1698-1703, 2004. Also see subsequent papers (pp. 1703-1756) in this issue of Science.

  

8. M.J. Mumma, R.E. Novak, M.A. DiSanti, and B.P. Bonev, “A Sensitive Search for Methane on Mars,” AAS/DPS 35th Meeting, September 1-6, 2003.

  

9. V.A. Krasnopolsky, J.P. Maillard, and T.C. Owen, “Detection of Methane in the Martian Atmosphere: Evidence for Life,” European Geophysical Union Meeting, Nice, May, 2004.

  

10. V. Formisano, S. Atreya, T. Encrenaz, N. Ignatiev, and M. Giuranna, “Detection of Methane in the Atmosphere of Mars,” Science 306: 1758-1761, 2004.

  

11. J.S. Kargel, “Proof for Water, Hints of Life?” Science 306: 1689-1691, 2004.

  

12. For more information about MEPAG and its activities see, for example, <mepag.jpl.nasa.gov>.

  

13. National Research Council, New Frontiers in the Solar System: An Integrated Exploration Strategy, The National Academies Press, Washington, D.C., 2003.

  

14. See, for example, National Aeronautics and Space Administration (NASA), The Vision for Space Exploration, NP-2004-01-334-HQ, NASA, Washington, D.C., 2004.

  

15. J. Douglas McCuistion, Mars Exploration Program, NASA Headquarters, presentation to the committee, March 29, 2006.

  

16. D.J. McCleese et al., Mars Exploration Strategy 2007-2016, NASA, Jet Propulsion Laboratory, Pasadena, Calif., 2006.

  

17. D.J. McCleese et al., Mars Exploration Strategy 2007-2016, NASA, Jet Propulsion Laboratory, Pasadena, Calif., 2006, p. 9.

  

18. National Research Council, New Frontiers in the Solar System: An Integrated Exploration Strategy, The National Academies Press, Washington, D.C., 2003, p. 194.

  

19. NASA, Science Mission Directorate, A Roadmap for the Robotic and Human Exploration of Mars, NASA Headquarters, Washington, D.C., 2005, p. ES-3. Available at <images.spaceref.com/news/2005/srm2_mars_rdmp_final.pdf>.

  

20. National Research Council, Review of Goals and Plans for NASA’s Space and Earth Sciences, The National Academies Press, Washington, D.C., 2006, p. 11.

  

21. MEPAG’s study of MSTO is available at <mepag.jpl.nasa.gov/reports/MSTO_SAG_report.doc>.



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