Impacts and the early environment and evolution of the terrestrial planets

Details Impacts and the early environment and evolution of the terrestrial planets Impacts and the early environment and evolution of the terrestrial planets

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pggp.rept..359m&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990 p 359 (SEE N92-10728 01-91)

Physics

Geophysics

Hypervelocity Impact, Meteorite Collisions, Planetary Evolution, Planets, Terrestrial Planets, Ejecta, Frequency Distribution, Mass Distribution, Planetary Atmospheres, Planetary Composition, Projectiles

Scientific paper

It is now admitted that very large impacts may have played an important role in the accretion of the terrestrial planets. The size-frequency distribution of these impacts fits the formal definition of a catastrophic process: the mass and momentum added by a rare large impact is larger than that added by all the more frequent small impacts combined. The effects of such large impacts on the thermal states of growing planets is discussed. At a later stage of planetary evolution, the smaller impacts during late heavy bombardment may have played an important role in stripping the original gaseous atmospheres of the planets and in segregating condensible substances from volatile ones.

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