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Embryos of the Moon and the Earth may have formed as a result of contractionof a common parental rarefied condensation. The required angular momentum ofthis condensation could largely be acquired in a collision of two rarefiedcondensations producing the parental condensation. With the subsequent growthof embryos of the Moon and the Earth taken into account, the total mass ofas-formed embryos needed to reach the current angular momentum of theEarth-Moon system could be below 0.01 of the Earth mass. For the low lunar ironabundance to be reproduced with the growth of originally iron-depleted embryosof the Moon and the Earth just by the accretion of planetesimals, the mass ofthe lunar embryo should have increased by a factor of 1.3 at the most. Themaximum increase in the mass of the Earth embryo due to the accumulation ofplanetesimals in a gas-free medium is then threefold, and the currentterrestrial iron abundance is not attained. If the embryos are assumed to havegrown just by accumulating solid planetesimals (without the ejection of matterfrom the embryos), it is hard to reproduce the current lunar and terrestrialiron abundances at any initial abundance in the embryos. For the current lunariron abundance to be reproduced, the amount of matter ejected from the Earthembryo and infalling onto the Moon embryo should have been an order ofmagnitude larger than the sum of the overall mass of planetesimals infallingdirectly on the Moon embryo and the initial mass of the Moon embryo, which hadformed from the parental condensation, if the original embryo had the same ironabundance as the planetesimals. The greater part of matter incorporated intothe Moon embryo could be ejected from the Earth in its multiple collisions withplanetesimals (and smaller bodies).

Formation of embryos of the Earth and the Moon from the common rarefied condensation and their subsequent growth