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- W2078840579 abstract "A widely held assumption that the distribution of mass and angular momentum in the Earth-Moon system is anomalous when compared with the corresponding distributions in other planet-satellite systems is critically examined. In order to make valid comparisons, the light gases which were originally associated with the satellites of Jupiter, Saturn, Uranus and Neptune, and which have since escaped, should be taken into account. It is shown that the original mass ratios of protosatellite systems of Jupiter, Saturn and Neptune to their respective primaries were about 1/100. Likewise, the minimum mass of the primordial solar nebula was about 1% of the Sun's mass. These mass ratios are similar to that observed in the Earth-Moon system, which therefore cannot be held to be anomalous. Likewise, when due account is taken of transfer of angular momentum between Earth and Moon by tidal interaction and loss of angular momentum from the satellites of the giant planets carried away by light gases which escaped, it cannot be asserted that a serious discrepancy exists between the original angular momentum distribution in the Earth-Moon system and the original angular momentum distribution in other systems. These considerations suggest that the Earth-Moon system may not differ fundamentally in its nature from the other systems. The remarkable relationship, A = kM23, which holds between angular momentum density A and mass M for the larger asteroids, most planets, the solar system as a whole and rapidly rotating, young O and B stars, is discussed. It is argued that this relationship results from formation of these bodies originally at the rotational instability limit, followed by loss of nebulae and/or atmospheres to which angular momentum was transferred. As a result of these losses of angular momentum, the rotational periods of most of these bodies are now 2 to 4 times larger than the rotational instability periods. The combined Earth-Moon system closely follows the A = kM23 relationship, whereas the Earth alone is seriously discordant. Besides constituting a strong argument that Earth and Moon possess a genetic relationship and were born in a common region of space, this relationship also suggests that formation of the Earth-Moon system was originally governed by the rotational instability criterion and was followed by the loss of a primitive atmosphere carrying excess angular momentum. These considerations support a hypothesis originally advanced on geochemical grounds that the Earth once possessed a massive primitive atmosphere which was lost, and that the formation of the Moon is connected with the loss of this primitive atmosphere." @default.
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- W2078840579 date "1972-01-01" @default.
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- W2078840579 title "Some comparative aspects of lunar origin" @default.
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- W2078840579 doi "https://doi.org/10.1016/0031-9201(72)90060-x" @default.
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