"Astrobiology, also called exobiology or xenobiology, a multidisciplinary field dealing with the nature, existence, and search for extraterrestrial life (life beyond Earth). Astrobiology encompasses areas of biology, astronomy, and geology." (Encyclopædia Britannica, Inc., 2013)


"Astrobiology". Encyclopædia Britannica, Encyclopædia Britannica, Inc. Last modified July 23, 2013.
Accessed February 1, 2019.

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