Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998lpico.957...54y&link_type=abstract
Origin of the Earth and Moon, Proceedings of the Conference held 1-3 December, 1998 in Monterey, California. LPI Contribution N
Physics
Ejecta, Moon, Projectiles, Hypervelocity Impact, Point Impact, Cometary Collisions, Asteroid Collisions, Craters
Scientific paper
Jetting is the earliest stage of impact cratering when a projectile first contacts a target. Its velocity exceeds impact velocity though it seems to involve only a small fraction of the projectile's mass. It is suggested that jetted ejecta generated by the giant impact could form the Moon. Jetting could erode the terrestrial atmosphere and play an important role in the early history of the terrestrial atmosphere. Jetting phenomenon is well understood for a simple case where two plates converge obliquely. Our understanding is not enough, however, even for a little more realistic cometary and asteroidal impact configuration in which a spherical projectile collides with a plane surface. More experimental works are necessary as well as analytical and numerical studies to examine the importance of the phenomenon.
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