That's the stereotypical idea about extraterrestrials. This is a Theory about biological life somewhere else, intelligence or not. It's is different. We only know this much. Nothing beyond the earth. If the life happened with millions of years revolution here, why it cannot happen somewhere else. Biological existence we know depend on a what we have on this earth. Life adopts. We don't know if it has adopted with different circumstances in somewhere else. When the possibility exits, we cannot deny it only because we yet do not know.
IIN to believe in aliens?
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That's the stereotypical idea about extraterrestrials. This is a Theory about biological life somewhere else, intelligence or not. It's is different. We only know this much. Nothing beyond the earth. If the life happened with millions of years revolution here, why it cannot happen somewhere else. Biological existence we know depend on a what we have on this earth. Life adopts. We don't know if it has adopted with different circumstances in somewhere else. When the possibility exits, we cannot deny it only because we yet do not know.