Someone who studies planetary systems is called a planetary scientist
They could either be a planetologist, a planetary scientist, or planetary astronomer.
Dusty Disk Systems, Hot Jupiter Systems, Non-planetary systems.
The name for someone who studies caves is a speleologist or a spelunker.
A psychologist is the proper name for someone who studies the mind.
There is no special name for someone who studies Hebrew.
An astronomer is a general term for someone who studies space, including planets, stars, galaxies, and other celestial bodies. They use techniques in physics and mathematics to understand the universe and its origins. They often use tools such as telescopes and spacecraft to observe and gather data.
chemist
Eugenicists
microbiologist :)
A geologist.
Ornothologist
chemist