Astronomy

I am listing top astronomy colleges, do check the list below:
Indian Institute of Astrophysics
Bengaluru
National Centre for Radio Astrophysics
Pune
Physical Research Laboratory
University of Delhi (DU)
Indian Institute of Technology, Guwahati (IIT-G)
Banaras Hindu University, Varanasi (BHU).

Do your graduation as B.Tech /B.E/B.Sc with CS/IT/EC/EEE/EE. And after that, prepare for ISRO exam which is available for a graduate. If you qualify in this exam, then you can be a scientist in ISRO.

Hello dear,
It is very nice that you have such a beautiful dream. You can get a job of a scientist after B.Tech ECE, so you should do 12th with Non-Medical and then do engineering in Electronics and Communication. You can also enter in DRDO (but not scientist) after doing Polytechnic Diploma in electronics and communication.

Yes, Xavier's College-Mumbai offers B.Sc in physics. Eligibility for the same, are you must have studied physics in class 11th and class 12th. Admission are based on merit list, which are almost out. Fill the application ASAP, if they are open yet.

Hello,
I hope you are doing well. Below is the cut off for different category along with closing and opening rank for IIST in aerospace engineering. Aerospace Engineering
General category
Open 335
close 4450
OBC category
open 142
close 1833
SC category
open 287
close 1864
ST category
open 535
close 995.

It depends on how much skills and experience do you have. If you are a fresher, then starting may be about 2.5 to 3. But if you are experienced, then it will give you a lot better.

The best government. College of India Offering astronomy and astrophysics are:
IIST KERELA, IISC - BANGALORE, IISER - branches, Indian Institute of astrophysics (the best in the country).
https://www.iiap.res.in/
and IUAP (Inter-University Centre for Astronomy and Astrophysics) Pune.
Best of luck.

Yes, as you have completed your diploma you could also get a lateral entry for direct admission in the 2nd year of your relevant field.