An astronomer
When the scientist studies the stars that's an astronomer, and in space it's an astronaut. The person might also be a father or mother, or a footballer, because people tend to be multi-skilled.
A Planetary scientist
Astronoms
they are called astronauts. :-)
An Astronomer is a scientist who studies the stars and planets.
Astronomers
A scientist that studies fungi is called a mycologist.
A biotechnology scientist.
A historical scientist.
An Oceanographer. Marine Biologist, that sort of thing.
A scientist that studies bears would be called an ursinologist.
a scientist who studys cells are called what
virologist
A meteorologist.
An aviologist.
biologist
astronomer