It depends on what you're studying besides black holes. If you're studying planets along with black holes, you could be an astrophysicist. Or, if you're studying atoms along with black holes, you could be a theoretical physicist. Just a few examples.
I do and any astronomer who is interested.
Physicists
Physicist
Astronomy.
zoologistZoologist are scientist that study animals
Geologists
The correct title for someone who studies volcanoes and volcanic activity is vulcanologist, also spelled volcanologist.
A paleontologist studies the history of plants and animals.
Paleontologists study fossils and ancient life, including, but not limited to, dinosaurs. A Paleobotanist studies plant fossils. Palaeontologist / paleontologist.
The name for this type of scientist is a teuthologist
A geological scientist studies rock and stones.
a type of scientist who studies about metal is called metallururgist
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The type of scientist that studies the environment is an enviromentologist.
what scientist studies hydrogen and oxygen
chromotologists
Aeronomist
A botanist.
An Entomologist
taxonomistBotanist
A zoologist.