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There are so many things that could not be a falsifiable hypothesis. One statement that is not falsifiable is that humans need air to breathe.
extraterrestrial or not http://henadzifilipenka.blogspot.com
Extraterrestrial Live was created in 1982.
Extraterrestrial rock is rock that did not originate from Earth.
Extraterrestrial is an adjective, meaning not of this Earth.