September 2011
Popular Mechanics;Sep2011, Vol. 188 Issue 9, p14
The article offers information on three theories on where the moon came from. According to first theory, moon and Earth condensed at the same time from the original nebula which created the solar system. Second theory says that the Earth's gravity ensnared the moon that was formed elsewhere. The third theory says that a moon was formed by collision of Mars-size body with Earth nearly 4.5 billion years ago.


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