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Old January 4th, 2018 #44
Ray Allan
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Join Date: May 2014
Posts: 15,170
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Our solar system and planet Earth are at least 4 billion years old, long enough for other civilizations in the galaxy that may have arisen to have noticed its existence and detected the oxygen and liquid water that as far as we humans know is necessary in the development of life. ETs may have known about us for a very long time now, but we probably are much too primitive to even bother with at this point.
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