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Memory Alpha

An exobiologist (also referred to as astrobiologist or xenobiologist) was a biologist who specialized in the field of alien biology, or exobiology. One title on Cardassia Prime was chief exobiology specialist. (VOY: "Nothing Human")

Doctor Phlox once noted to Cutler that he found her "assistance in the field invaluable" due to her training as an exobiologist. (ENT: "Dear Doctor")

Rudolph Ransom was a Starfleet exobiologist who was promoted to captain after he made first contact with the Yridians. (VOY: "Equinox")

In early 2368, two new exobiologists and three stellar cartographers transferred from the USS Zhukov to the USS Enterprise-D. (TNG: "The Game")

In 2371, a team of specialists, specifically xenobiologists and exopsychologists, were planned to be assembled on Starbase 201 awaiting for the arrival of a Jem'Hadar youth discovered by Quark. Odo, who disliked the idea of the youth being "studied like a laboratory specimen" as proposed by Starfleet, offered to raise the youth so as to be treated like a civilized being. (DS9: "The Abandoned")

After observing a Species 8472, who was apparently regenerating, in 2374, The Doctor stated that, "I'm no exobiologist, but I'd say this fellow is becoming highly agitated." (VOY: "Prey")

Known exobiologists

A deleted scene from the Star Trek: The Next Generation episode "Remember Me" referred to an exobiologist named Cara Hill, the wife of Dr. Richard Hill, who served on the Enterprise-D.

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