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Theories of The Origin of the MoonThe Moon is the only natural satellite of Earth The distance from Earthis about384400km with a diameter of 3476km and a mass of 7351022kg Throughhistory it has had many names Called Luna by the Romans Selene andArtemisby the Greeks And of course has been known through prehistoric timesIt isthe second brightest object in the sky after the Sun Due to its size andcomposition the Moon is sometimes classified as a terrestrial planetalong withMercury Venus Earth and Mars Origin of the MoonBefore the modern age of space exploration scientists had three majortheories for the origin of the moon fission from the earth formation inearthorbit and formation far from earth Then in 1975 having studied moonrocksand close-up pictures of the moon scientists proposed what has come to beregarded as the most probable of the theories of formation planetesimalimpactor giant impact theory Formation by Fission from the EarthThe modern version of this theory proposes that the moon was spun off fromthe earth when the earth was young and rotating rapidly on its axis Thisideagained support partly because the density of the moon is the same as thatofthe rocks just below the crust or upper mantle of the earth A majordifficultywith this theory is that the angular momentum of the earth in order toachieverotational instability would have to have been much greater than theangularmomentum of the present earth-moon system Formation in Orbit Near the EarthThis theory proposes that the earth and moon and all other bodies of thesolarsystem condensed independently out of the huge cloud of cold gases andsolidparticles that constituted the primordial solar nebula Much of thismaterialfinally collected at the center to form the sun Formation Far from Earth According to this theory independent formation of the earth and moon asinthe above theory is assumed but the moon is supposed to have formed at adifferent place in the solar system far from earth The orbits of theearth andmoon then it is surmised
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