hey there,
Yes, you can study Astrophysics after 12th.
Astrophysics courses deals with the basics of Physics and teaches students how to apply the various laws of physics in the field of Astronomy.
The eligibility criteria for pursuing Under-graduate courses are,
Admission process-
Merit-based: Some colleges take admission on the basis of merit obtained in the qualifying exam.
Entrance based: Some colleges take admission on the basis of a national level, Institute level or a state level entrance exam.
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