No, biology is not included in exobiology. It may be talked
about, but it isn't included. Biology and exobiology are
similar.
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Xenobiology, Exobiology or Astrobiology
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life or its possibility on other planets. Exobiology or
Astrobiology, search for extraterrestrial life within the solar
system and throughout the universe.
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Astronomy is the study of heavenly bodies.
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It is called astrobiology, xenobiology or exobiology.