There has never been any credible, reproducible evidence of the existence of
aliens. Mainstream researchers refer to people who study them as "wing nuts".
A person who believes in aliens is often referred to as an "alien enthusiast" or someone who is "believes in extraterrestrial life."
He is called 'unemployed' and 'seeking other opportunities', since there are no aliens available to study.
A scientist who studies animals that produce their own light is called a bioluminescence researcher or a marine biologist specializing in bioluminescent organisms.
Someone who studies aeronautics is typically referred to as an aeronautical engineer or aerospace engineer. These professionals specialize in the design, development, and testing of aircraft and spacecraft. They may also engage in research related to aircraft systems, flight dynamics, and aerodynamics.
A physicist and a pathologist. There is no single term for someone that does both. A pathologist may specifically study the effects of gravity on vaccines
A person who believes in aliens is often referred to as an "alien enthusiast" or someone who is "believes in extraterrestrial life."
You call someone that studies metal a metallurgist.
A physicist.
Lonely. Xenophilic, perhaps.
a person who studies planets is a planetologist.
florist
Microbiologists
An Anthropologist.
A Zoologist
Brocollogist
malacologist
A physicist.