UFO's - Are we alone out there... T-Shirt
Extra-terrestrial life is hypothetical life which may occur outside of Earth and which did not originate on Earth. Such life might range from simple prokaryotes (or comparable life forms), to beings with civilizations far more advanced than humanity. The science of extra-terrestrial life in all its forms is known as astrobiology. From the mid-20th century, active ongoing research has taken place to look for signs of extra-terrestrial life (Wikipedia). Many people believe we are not the only intelligent beings on earth. What do you believe?
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