''Microbe'' (from the [[Greek]] ''mikros'' small) means a form of life too small to see with the naked eye.
''Microbe'' (from the [[Greek]] ''mikros'' small) means a form of life too small to see with the naked eye.
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''Sentient'' life, also called ''sapient'' life (from the official binomial name of man, ''Homo sapiens''), means life that is aware of itself and the ability to reason.
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''Sentient'' life, also called ''sapient'' life (from the official binomial name of man, ''Homo sapiens''), means life that is aware of itself and has language and the ability to reason.
''Person'' means a sentient individual.
''Person'' means a sentient individual.
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''[[UFO]]'' means unidentified flying object.
''[[UFO]]'' means unidentified flying object.
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== Extraterrestrial life as a scientific hypothesis ==
== Extraterrestrial life as a scientific hypothesis ==