A person who studies that category is called an astronomer.
geologist
Astrophysics is an area of science that studies the universe, including stars and other celestial bodies in particular.
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A seismologist. Names, I'm not so good at.
A geologist or a avalanche specialist studies the amazing snow hazards called avalanches...
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A virologist is a scientist who studies viruses.
A scientist who studies animals is called a zoologist.
A scientist who studies radioactivity is called a nuclear physicist or a radiologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The name for this type of scientist is a teuthologist
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
you need an understanding of astrophysics, physics, and quantum physics, as well as knowledge about how to use telescopes (optical and otherwise) and how to interpret the data recieved
Astronomer
environmentalist
ecologist