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someone that studies alien life forms.
An exabiologist is one who studies alien life forms; creatures that do not originate from Earth. :)
An alienologist is a person who studies aliens, the possible existence of alien or non-terrestrial life.
A scientist that studies animal life is a Zoologist.
A person who studies the remains of human life is called an archaeologist.
The person who studies the way of life is called a paleontologist.
Biology is the study of life. Biologist is a person who studies life.
analist
It could be called extra-terresrtial, or even alien
They are named Botanist :)
paleontology
An astrobiologist.