- The Chicago Astronomer -
Copyright 2004-2014 All rights reserved by Joseph Guzman Administrator/Founder/Chief Astronomer.
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In a way it makes sense for the lunar rocks to be rich in oxygen content. It existed way back when the Earth and Moon first formed, but became chemically bound to other rocks because oxygen is so reactive. On Earth we have 20% in the atmosphere only because biological processes counter the continuing tendency of oxygen to bind with rocks. Since the Moon doesn't have biological activity like Earth does, all it's oxygen should be lying on the ground.
If the universe is a ball the size of America, then the solar system is almost as large as the smallest cell in the human body.