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I assume the moon is also too small to maintain an atmosphere too...ie..not enough mass !
Your question assumes, first of all, that the moon originated from the earth, accepting the generally accepted theory.If that is the case, then the moon is made up of similar material as the earth (plus all the material brought by the various space objects that have pounded into it).However, the moon lacks the mass to sufficiently press upon its core and continually heat itself- meaning that there is no iron core spinning in the center of the moon. This means that the moon lacks a magnetic field similar to the Earth's. It only has pockets of magnetism concentrated around where magnetic material lies inside the moon.Because of this, it does not divert all the various and harmful rays that the sun blasts towards it. These rays prevent the moon from forming an atmosphere, making it extremely hard for water to collect on the moon's surface. Most life we are used to relies on water as fuel, and without it there usually isn't any life. Plus life usually needs gasses- which are not present on the moon due to its lack of atmosphere.
Quote from: neilep on 20/07/2009 16:37:08I assume the moon is also too small to maintain an atmosphere too...ie..not enough mass !Titan has a quite dense atmosphere.
I don't think Venus has a magnetosphere. What keeps its atmosphere intact?Same for Titan, both of these bodies have thicker atmospheres than Earth's (atmospheric pressure on Titan is about the same as Earth's but with less gravity the atmosphere has to be thicker to have the same pressure).