Abstract
Comets belong to a group of small bodies generally known as icy planetesimals. Today the most primitive icy planetesimals are the Kuiper Belt objects (KBOs) occupying a roughly planar domain beyond Neptune. KBOs may be scattered inward, allowing them to collide with planets. Others may move outward, some all the way into the Oort cloud. This is a spherical distribution of comet nuclei at a mean distance of ∼50,000 AU. These nuclei are occasionally perturbed into orbits that intersect the paths of the planets, again allowing collisions. The composition of the atmosphere of Jupiter—and thus possibly all outer planets—shows the effects of massive early contributions from extremely primitive icy bodies that must have been close relatives of the KBOs. Titan may itself have a composition similar to that of Oort cloud comets. The origin and early evolution of its atmosphere invites comparison with that of the early Earth. Impacts of comets must have brought water and other volatile compounds to the Earth and the other inner planets, contributing to the reservoir of key ingredients for the origin of life. The magnitude of these contributions remains unknown but should be accessible to measurements by instruments on spacecraft.
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C. Arpigny, E. Jehin, J. Manfroid, D. Hutsemékers, R. Schulz, J.A. Stüwe et al., Science 301, 1522 (2003)
H. Balsiger, J. Altwegg, J. Geiss, J. Geophys. Res. 100, 5827 (1995)
A. Bar-Nun, A.I. Kleinfeld, E. Kochavi, Phys. Rev. 38, 7749 (1988)
D.D. Bogard, R.N. Clayton, K. Marti, T. Owen, G. Turner, in Chronology and Evolution of Mars, ed. by R. Kallenbach, J. Geiss, W.K. Hartmann (Kluwer, Dordrecht, 2001), pp. 425–458
A.L. Cochran, Astrophys. J. Lett. 576, L165 (2002)
A.L. Cochran et al., in Precision Spectroscopy in Astrophysics, ed. by N. Santos (Springer, Berlin, 2007), 263–265 in press)
A.H. Delsemme, in The Molecular Origins of Life, ed. by A. Brack (Cambridge University Press, Cambridge, 1998), pp. 100–118
A.H. Delsemme, Icarus 146, 313 (2000)
T.M. Donahue, J.H. Hoffman, R.R. Hodges Jr., A.J. Watson, Science 216, 630 (1982)
T.M. Donahue, J.B. Pollack, in Venus, ed. by D.M. Hunten, L. Colin, T.M. Donahue, V.I. Moroz (University of Arizona, Tucson, 1983), pp. 1003–1036
P.M. Eberhardt, D. Reber, D. Krankowsky, R.R. Hodges, Astron. Astrophys. 302, 301 (1995)
M. Flasar, R.K. Achterberg, B.J. Conrath, J.C. Pearl, G.L. Bjoraker, D.E. Jennings, P.N. Romani et al., Science 307, 1247 (2005)
J. Geiss, Rev. Mod. Astron. 1, 1 (1988)
S.S. Genuth, Comets, Popular Culture and the Birth of Modern Cosmology (Princeton University Press, Princeton, 1997). 365 pp
J.P. Greenwood, S. Itoh, N. Sakamoto, E.P. Vicenzi, H. Yurimoto, 38th Lunar and Planetary Science Conference (Lunar and Planetary Science XXXVIII), LPI Contribution No. 1338, 2007, p. 2134
N. Grevesse, M. Asplund, A.J. Sauval, Space Sci. Rev. 130, 105 (2007)
H. Hsieh, D. Jewitt, Science 312, 561 (2006)
G. Hurst, The Astronomer, Electronic Circ. No. 1177, 22 March, 1997
E. Jehin, J. Manfroid, A.L. Cochran, C. Arpigny, J.-M. Zucconi, D. Hutsemékers et al., Astrophys. J. Lett. 613, L161 (2004)
E. Jehin, J. Manfroid, D. Hutsemékers, A.L. Cochran, C. Arpigny, W.M. Jackson et al., Astrophys. J. Lett. 641, L145 (2006)
H.R. Karlsson, R.N. Clayton, E.K. Gibson Jr., T.K. Mayeda, Science 255, 1409 (1992)
T. Lanz, K. Cunha, J. Holtzman, I. Hubeny, Astrophys. J. (2008, in press)
C. Lecluse, F. Robert, Geochim. Cosmochim. Acta 58, 2297 (1994)
L.A. Leshin, S. Epstein, E.M. Stolper, Geochim. Cosmochim. Acta 60, 2635 (1996)
K. Lodders, Astrophys. J. (2008, in press)
M.B. McElroy, T.Y. Kong, Y.L. Yung, J. Geophys. Res. 82, 4379 (1977)
A. Meibom, A.N. Krot, F. Robert, S. Mostefaoui, S.S. Russell, M.I. Petaev et al., Astrophys. J. 656, L33 (2007)
H.J. Melosh, A.M. Vickery, Nature 338, 487 (1989)
S. Messenger, Nature 404, 968 (2000)
M. Mumma et al., IAU Circ. 8890, July 11, 2007
H.B. Niemann, S.K. Atreya, S.J. Bauer, G.R. Carignan, J.E. Demick, R.L. Frost et al., Nature 438, 779 (2005)
H.B. Niemann, S.K. Atreya, G.R. Carignan, T.M. Donahue, J.A. Haberman, D.N. Harpold, J. Geophys. Res. 103, 22,831 (1998)
J. Oro, Nature 190, 389 (1961)
T. Owen, A. Bar-Nun, Icarus 116, 215 (1995)
T. Owen, A. Bar-Nun, in Origin of the Earth and Moon, ed. by R.M. Canup, K. Righter (University of Arizona Press, Tucson, 2000), pp. 459–471
T. Owen, Th. Encrenaz, Space Sci. Rev. 106, 121 (2003)
T. Owen, Th. Encrenaz, Planet. Space Sci. 54, 1188 (2006)
T. Owen, P. Mahaffy, H.B. Niemann, S. Atreya, T. Donahue, A. Bar-Nun et al., Nature 402, 269 (1999)
T. Owen, P. Mahaffy, H.B. Niemann, S. Atreya, M. Wong, Astrophys. J. 553, L77 (2001)
J.B. Pollack, P. Bodenheimer, in Origin and Evolution of Planetary and Satellite Atmospheres, ed. by S.K. Atreya, J.B. Pollack, M.S. Matthews (University of Arizona Press, Tucson, 1989), pp. 564–602
T.D. Swindle, in Meteorites and the Early Solar System, ed. by J.F. Kerridge, M.S. Matthews (University of Arizona Press, Tucson, 1988), pp. 541–542
R. Terzieva, E. Herbst, Monthly Not. Roy. Astron. Soc. 317, 563 (2000)
F.L. Whipple, Astrophys. J. 111, 375 (1950)
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Owen, T. The Contributions of Comets to Planets, Atmospheres, and Life: Insights from Cassini-Huygens, Galileo, Giotto, and Inner Planet Missions. Space Sci Rev 138, 301–316 (2008). https://doi.org/10.1007/s11214-008-9306-7
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DOI: https://doi.org/10.1007/s11214-008-9306-7