Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974plug.nasa...13b&link_type=abstract
In its A Primer in Lunar Geology p 13-25 (SEE N75-13730 04-91)
Astronomy and Astrophysics
Astrophysics
Asteroids, Lunar Evolution, Solar System, Stellar Evolution, Astrophysics, Celestial Bodies, Earth-Moon System, Particle Collisions, Planetary Evolution
Scientific paper
The available evidence strongly suggests that planets formed by accretion through a hierarchy of particle masses. The terminal stages for this process probably involved collisions between large bodies. The region of the solar system which is known as the asteroid belt is one where for some reason this accretion process was not carried to completion. The terminal phase of planetary formation was a hectic one in the sense that high velocity debris of varying sizes were moving from as far out as Jupiter into the region of the terrestrial planets. Most of the terrestrial planets were surrounded by swarms of smaller bodies during this terminal phase. The moon, or the bulk of it, was formed in a region of the solar system different than that in which the earth formed, and was captured upon close passage to the earth as a consequence of a collision with circum-terrestrial material. Once captured, its surface was bombarded by particles in terrestrial orbit, as well as particles like the moon which came from other regions of the solar system.
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