What could i do with a masters in astronomy/astrophysics?
With a bachelors in astronomy or astrophysics, you could teach high school in some states (although most won't hire someone just to teach astronomy), work for a museum, or do some sort of research assistant/outreach coordinator job for a large university or NASA (very few of those jobs exist). With a masters, you can do all that and teach community college. But if you want to teach at a 4-year college or university and/or do research in the field, you'll need a PhD (major in physics in college, then go for a PhD in astronomy or physics). There aren't a ton of those jobs, so there's a lot of competition, and you have to be willing to move anywhere to take the job. None of these jobs tend to pay very well, but pay comfortably (with a PhD, most people just out of grad school make between 40k and 60k a year, goes up after a few years but not a lot). No one does it for the money.
Physics? Astronomy? Astrophysics?
What should I major in to work on outer space? How to be an astrophysicist? Tips in high school or college? Will I need a PhD? All information is helpful. Thank you!
Are there any IIT institutes for astronomy/astrophysics?
I would say that this is the right time to make a brief sketch of your future career if not make the exact decision. Since you are in 9th standard, in India, and seem to have interest in Astrophysics, you might want to look at this: Career In Astronomy . But certainly, your base of Mathematics and Physics need to be strong if you really want to make it count.Indian Institute of Astrophysics is the prime authority for the subject in India. Their website will provide you almost all details on the subject and career in India.As for IITs, none of them provide Astronomy as a major/minor course, since its not a mainstream subject. But IISc Bangalore does provide some related course. Outside India, however, there are institutes which provide such courses. Their fees are usually high, but you can manage that with scholarships, by clearing a few entrance exams. Some people take up part time jobs, but those are redundant.Regarding whether IITs are compulsory for good future career , the answer is both YES and NO. It depends on what are you trying to achieve in life ?A high paying job with little emphasis on research, or an academically/scientifically challenging task with maybe, a low salary ? If you are looking for the first one, IITs, NITs, or other Engineering institutes should be your target. The curriculum at these institutes are more technical (or job oriented) and somewhat less research oriented. Otherwise you should look enrol in a Science course. There are brilliant institutes in India such as IISc, IISER etc, which are at par with the popularity of IITs (sometimes better too), though their course structures are substantially different. Doing Class 11 & 12 from outside India will make almost no difference actually. When you have cleared your Higher Secondary, do some background check and enroll in a reputed institute in India/abroad (make sure to enrol in the right course too, depending on what are YOUR goals, do not blindly copy others). Today's world demands talent and capability, hence if you have the "thunder" within, you will surely achieve your goal in due time. There is one technical jargon you need to correct: you do not say "IIT institutes" rather just IIT, since the word "institute" is already included in the abbreviation of IIT.
Jobs if you like astronomy?
There aren't a lot of jobs in astronomy, and almost all of them require a PhD in astronomy or physics. Astronomers work for colleges and universities (teaching and doing reserach), national labs, observatories, and NASA (research jobs). It's 8-12 years of college and a few more of postdocs (short research appointments) before you get a 'real' job, and since there are so few jobs you have to be willing to move pretty much anywhere to take a job, including out of the country. You can start at most 4-year colleges or universities and major in physics. Astronomy is a good double major if they offer it, but it's fine if they don't. Physics is essential.