Hello Aviral,

Here is some branches related to aerospace;

1. Aerodynamics.

2. Aero Structural mechanics.

3. Propulsion.

4. Flight dynamics (performance and control).

5. Systems and integration.

6. Aerospace materials.

7.  Missile dynamics.

8. Space mechanics.

9. Avionics (Aviation electronics).

10. Rocketry.

Hope this will help you. Best of luck.