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

9. National Aeronautics and Space Administration, An Exobiology Strategy for Mars Exploration, National Aeronautics and Space Administration, Washington, D.C., 1995.

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

11. See, for example, National Research Council, Assessment of Mars Science and Mission Priorities, The National Academies Press, Washington D.C., 2001.

12. See, for example, National Research Council, Assessment of NASA’s Mars Architecture 2007-2016, The National Academies Press, Washington D.C. 2006.

13. National Research Council, Limits of Organic Life in Planetary Systems, The National Academies Press, Washington D.C., 2007.

14. See, for example, N.R. Pace, “The Nature of Biochemistry in the Universe,” and S.A. Benner, “Chance and Necessity in Biomolecular Chemistry: Is Life as We Know It Universal?” pp. 59-63 and 64-67 in National Research Council, Signs of Life: A Report Based on the April 2000 Workshop on Life Detection Techniques, The National Academies Press, Washington, D.C., 2002.

15. For a recent scientific discussion of some of the possibilities see, for example, D. Schulze-Makuch and L.N. Irwin, Life in the Universe: Expectations and Constraints, Springer, New York, 2004.



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