27. S.A. Sandford, J. Aléon, C.M.O’D. Alexander, T. Araki, S. Bajt, G.A. Baratta, J. Borg, J.P. Bradley, D.E. Brownlee, J.R. Brucato, M.J. Burchell, et al. 2006. Organics captured from comet 81P/Wild2 by the Stardust spacecraft. Science 314:1720-1724.

28. B. Marty, R.L. Palma, R.O. Pepin, L. Zimmermann, D.J. Schlutter, P.G. Burnard, A.J. Westphal, C.J. Snead, S. Bajt, R.H. Becker, and J.E. Simones. 2008. Helium and neon abundances and compositions in cometary matter. Science 319:75-78.

29. L.M. Feaga, M.F. A’Hearn, J.M. Sunshine, J.M. Groussin, and T.L. Farnham. 2007. Asymmetries in the distribution of H2O and CO2 in the inner coma of comet 9P/Tempel 1 as observed by Deep Impact. Icarus 190:345-356.

30. K.M. Barkume, M.E. Brown, and E.L. Schaller. 2008. Near-infrared spectra of Centaurs and Kuiper Belt objects. Astronomical Journal 135:55-67.

31. V.C. Geers, J.-C. Augereau, K.M. Pontoppidan, C.P. Dullemond, R. Visser, J.E. Kessler-Silacci, N.J. Evans, E.F. van Dishoeck, G.A. Blake, A.C.A. Boogert, J.M. Brown, et al. 2006. C2D Spitzer-IRS spectra of disks around T Tauri stars. II. PAH emission features. Astronomy and Astrophysics 459:545-556.

32. D.P. O’Brien, A. Morbidell, and H.F. Levison. 2006. Terrestrial planet formation with strong dynamical friction. Icarus 184:39-58.

33. Q.Z. Yin, S.B. Jacobsen, K. Yamashita, J. Blicher-Toft, P. Telouk, and F. Albarede. 2002. A short timescale for terrestrial planet formation from Hf-W chronometry of meteorites. Nature 418:949-952.

34. A.N. Halliday. 2004. The origin and earliest history of the Earth. Pp. 509-557 in Treatise on Geochemistry, Vol. 1. Meteorites, Comets, and Planets (A.M. Davis, ed.). Elsevier, Oxford, U.K.

35. T. Kleine, K. Mezger, C. Münker, H. Palme, and A. Bischoff. 2004. 182Hf-182W isotope systematics of chondrites, eucrites, and martian meteorites: Chronology of core formation and early mantle differentiation in Vesta and Mars. Geochimica et Cosmochimica Acta 68:2935-2946.

36. H.H. Hsieh and D. Jewitt. 2006. A population of comets in the main asteroid belt. Science 312:561-563.

37. K. Tsiganis, R. Gomes, Morbidelli, A., and H.F. Levison. 2005. Origin of the orbital architecture of the giant planets of the solar system. Nature 435:459-461.

38. R. Gomes, H.F. Levison, K. Tsiganis, and A. Morbidelli. 2005. Origin of the cataclysmic late heavy bombardment period of the terrestrial planets. Nature 435:466-469.

39. G. Strom, R. Malhotra, T. Ito, F. Yoshida, and D.A. Kring. 2005. The origin of planetary impactors in the inner solar system. Science 309:1847-1850.

40. J.E. Richardson and P.C. Thomas. 2010. Uncovering the saturnian impactor population via small satellite cratering records. 41st Lunar and Planetary Science Conference, The Woodlands, Texas. LPI Contribution No. 1533.

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

42. National Research Council. 2010. Defending Planet Earth: Near-Earth-Object Surveys and Hazard Mitigation Strategies. The National Academies Press, Washington, D.C.

43. S. Oleson and M. Khan. 2009. Radioisotope Electric Propulsion Studies: Kuiper Belt Object Orbiter. COMPASS Team, NASA Glenn Research Center, Cleveland, Ohio. July.

44. S.R. Oleson and M.L. McGuire and GRC COMPASS Team. 2007. COMPASS Final Report: Radioisotope Electric Propulsion (REP) Centaur Orbiter New Frontiers Mission. CD-2007-16. NASA Glenn Research Center, Cleveland, Ohio. November.

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

46. National Research Council. 2008. Opening New Frontiers in Space: Choices for the Next New Frontiers Announcement of Opportunity. The National Academies Press, Washington, D.C.

47. 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.

48. G.H. Fountain et al. 2008. Comet Surface Sample Study Report. SDO-11998. Prepared for NASA’s Planetary Science Division. NASA, Washington, D.C. April 30.

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement