Which course should I really take bsc biotech or bsc science ?

So , I passed 12th this year from India and realised that I took the wrong stream . I really don't want to get to the part why I did that because it doesn't matter . I was so indulged in doing NEET that I joined coaching and tried to go for it ( i failed miserably) while I was having a word with my friend what I really wanted to be when I grew up and I wanted to be near space , an astronomer , someone who can change the course of human civilization for the greater good ( small shit , big dreams ) . I don't want to second guess my career in college too . So here's the thing I've got two options either to pursue bsc or btech in biotech ( bsc most probably) or go for bsc physics and complete a math bridge program side by side where I also look for an alternative to include the biological subject in order to be an astrobiologist . I need advice on this really if someone you know or you are doing this . It would be great if you can drop your opinion because maybe MBBS is not my passion but space is something which I love from the start . I can't go back and take a diff stream but I still have a trick up my sleeve . So please , I would be glad if anyone came forward to this . Also , ik that there aren't high paying jobs in these fields but if I go abroad are there any chances for me to get a little higher pay than usual ?