23. National Research Council. 2002. The Quarantine and Certification of Martian Samples. National Academy Press, Washington, D.C.

24. National Research Council. 2007. An Astrobiology Strategy for the Exploration of Mars. The National Academies Press, Washington, D.C.

25. On May 25, 2011, following the completion of this report, NASA selected the OSIRIS-REx asteroid sample-return spacecraft as the third New Frontiers mission. Launch is scheduled for 2016.

26. For additional details concerning Gemini and recommendations for its future, see, for example, National Research Council, New Worlds, New Horizons in Astronomy and Astrophysics, The National Academies Press, Washington, D.C., 2010, pp. 177-179.

27. National Research Council. 2010. New Worlds, New Horizons in Astronomy and Astrophysics. The National Academies Press, Washington, D.C.

28. National Research Council. 2010. New Worlds, New Horizons in Astronomy and Astrophysics. The National Academies Press, Washington, D.C., p. 34.

29. For additional information about and recommendations concerning the LSST, see, for example, National Research Council, New Worlds, New Horizons in Astronomy and Astrophysics, The National Academies Press, Washington, D.C., 2010, pp. 224-225.



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