Hi Praveen,

The average salary of an astronomer in Tamil Nadu is INR 50,000 per month. While the minimum salary is around INR 30,000 per month and maximum salary of an aerospace engineer  in Tamil Nadu is around INR 8,00,000 or much more depending upon higher qualification and experience.

Refer here for more info -  https://engineering.careers360.com/tags/astronomy-and-astrophysics

To know your other best admission possibilities of Institutes & branches in JOSSA & State counseling as per your percentile, You can use JEE Main College Predictor tool given below

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!