A Historian.
space scientist Astronomers is the correct name for your question.
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.
Someone who studies planetary systems is called a planetary scientist
To politely correct someone about the spelling of your name, you can simply say, "I appreciate it, but my name is actually spelled correct spelling."
Heliologist
chemist
Eugenicists
microbiologist :)
A geologist.
Ornothologist