space scientist
Astronomers is the correct name for your question.
An astronomer or an astro physicist.
An astronomer.
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.
An astronomer, or an astronomical scientist. People who combine astronomy with physics to try and learn more about how the Universe was formed and what it consists of, are called Cosmologists.
They could either be a planetologist, a planetary scientist, or planetary astronomer.
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.
An astronomer who specializes in studying the sun is called a solar astronomer.
There is no special name for someone who studies Hebrew.
Someone who studies planetary systems is called a planetary scientist
Eugenicists
microbiologist :)