"Are we alone?" is a pretty big question. If the answer is "no," then humans are faced with the predicament of living among extraterrestrial beings in the universe. Science fiction has depicted various ways on how aliens could possibly contact humans. However, could these be really possible?
Although most of these are seen only in movies, various scientists have actually thought about these scenarios. Some of their ideas may have a scientific explanation, while others are way too far-fetched. Others have argued that the intelligent aliens would use either gigantic structures or smaller tools.
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