No NIT offers UG Courses in Astrophysics or Astronomy. Incase youre interested in Astrophysics, your first step should be a B.Sc. in Physics. After B.Sc. you may Postgraduate with Astrophysics and maybe even go on to pursue a PhD in future.
For more information about Astronomy & Astrophysics do follow the link below
https://www.careers360.com/courses/astrophysics-course
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