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Thursday, 10 April 2014

Creation of our Moon- The Giant Impact Theory

Professor Dr Pranab kumar Bhattacharya,* Miss Upasana Bhattacharya, ** Mr.Rupak Bhattacharya,** Mr. Ritwik Bhattacharya,** Miss Rupsa Bhattacharya ;*** Mrs Dalia Mukherjee; ***Mr Debasis Mukherjee;** Mr. Hindol Banerjee
* Daughter of Prof.Pranab kumar Bhattacharya ** 7/51 Purbapalli PO-Sodepur Dist 24 Parganas( North) Kolkata-110 *** Swamiji Nagar South Habra 24 Pargnas North West Bengal

GIANT IMPACT THEORY of origin of Moon in mid-1970s,emerged by.William K. Hartmann & D.R. Davis (Planetary Sciences InstituteTucson AZ) hypothesized that Earth, in course of its accumulation,underwent some majorcollisions with other bodies had substantial fraction of its mass and that these collision produced large vaporclouds that they believe might play a role in the formation of the Moon.A collision with a body having at least the mass of Mars would be needed to give the Earth the present angular momentum of the Earth-Moon system, In1984, scientific conference on origin of Moon was organized in, Hawaii, number of papers were discussed on various aspects of the giant impact theory.The giant impact theory emerged "fashionable" theory, but everyone agreed that it was relatively untested and that it would be appropriate to reserve judgement on it until a lot of testing has been conducted. The next step clearly called for numerical simulations on supercomputers.The Moon is computationally.The Moon is computationally unique,having not more than 4% its mass in form of iron core.This contrasts with Earth, a typical terrestrial planet's bulk composition, which has about one-third of its mass in form of iron core. Thus, simulation could notbe regarded "successful" unless material left in orbit was iron free or nearly so and was substantially in excess of mass of Moon. This uniqueness highly constrains conditions that must be imposed on the planetary collision scenario. If the Moon had a composition typical of other terrestrial planets, it would be far more difficult to determine the conditions that led to its formation
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  Sd/  Professor Pranab Kumar Bhattacharya  MD(Calcutta Univ) Professor and Head, Department of Pathology , School of Tropical  Medicine, Kolkata-700073

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