A black hole is an object in space. Astronomy is the study of
objects in space. Therefore, black holes would be among the topics
covered by astronomy.
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which topics for b.sc.it
projects.............................list
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Atronomers usually specialize in the study of Space (astronomy)
and Space Travel (Astronautics). If you ment specific topics within
Astronomy then there are loads.
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I find just about anything about astronomy interesting. To get specific details, start reading about astronomy in general, then read about specific topics. Here are some topics you may want to read about; you might start in Wikipedia, which usually has good summary articles: