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By B. A. Ivanov, G. Neukum, R. Wagner (auth.), Mikhail Ya. Marov, Hans Rickman (eds.)

The exploration of our sunlight method is swiftly becoming in significance as a systematic self-discipline. over the last a long time, nice development has been accomplished because the results of area missions to planets and small our bodies - as­ teroids and comets - and better remote-sensing tools, in addition to as a result of sophisticated options of laboratory measurements and a quick growth in theoretical stories, related to the improvement of varied astrophysical and geophysical versions. those types are established, particularly, at the technique of comparative planetology turning into a robust software in revealing evolu­ tionary techniques which were shaping the planets given that their starting place. Comets and asteroids, being pointed out as remnants of planetary formation, function a clue to the reconstruction of sun method historical past simply because they encapsulated the primordial fabric from which the planets have been equipped up. while, those interplanetary companies of unique subject and mes­ sengers from the earlier, being brought on through dynamical procedures good outdoor our neighboring area, have been answerable for a number of catastrophic occasions while impacting at the planets and therefore inflicting dramatic alterations in their typical stipulations. within the crossroads of astronomy and geophysics, contemporary years have visible a growing to be realizing of the significance of collisional tactics via­ out the heritage of the sun procedure and, for that reason, the need to get extra perception into the matter of interactions of planets and small bodies.

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M. (1994) The record of the past impacts on Earth, in Hazards due to Comets and Asteroids, (T. ) Univ. 417-462. K. (1977) Relative crater production rates on planets, Icarus 31, 260-276. K. , Icarus 60, 56-74. K. (1995) Planetary cratering I: Lunar highlands and tests of hypotheses on crater populations, Meteoritics 30, 451-467. A. and McEwen, A. (1999a) Recent Martian volcanism: New evidence from Mars Global Surveyor (abstract), LPSC XXX, CDROM edition, No. 1270. , James, P. and Veverka, J. (1999b) Evidence for recent volcanism on Mars from crater counts, Nature 397, 586-589.

The other smaller group was originally referred to as a group "above C" accounting for very high beginning heights. Today the notation D is used for this group. The Draconid meteor shower is a typical member of this group. It contains extremely friable meteoroids with the lowest known densities of all types of solid cometary material coming to the Earth (Ceplecha, 1968). Details on the four populations of big meteoroids (fireballs, bolides) can be found elsewhere (Ceplecha and McCrosky, 1976; Ceplecha, 1977, 1983, 1985, 1994; Sekanina, 1983; Wetherill and ReVelle, 1981a, b).

Thus the general picture of cratering on the terrestrial planets begins to look more similar and self-consistent. The questions for future study include the cometary contribution in impact crater formation, and the possible difference of SFD's of NEAs and the Main Belt at small « 1 km) sizes. , Woronov, A. and Young, R. (1978) Standard techniques for presentation and analysis of crater size-frequency data, Icarus 37, 467-474. C. J. (1996) Mechanical and geological effects of impact cratering on Ida, Icarus 120, 158-184.

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