I want to be an astronomer, but I don't know what I should specialize in or what I could specialize in.
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You don't have to figure that out until you're picking a dissertation project in grad school, and even then most people aren't doing what they did then 10 years later. In college, major in physics. Spend your summers doing research at your school or others to get some experience and exposure to the different fields. Then go to grad school for physics and astronomy.
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Maths and Physics without a doubt. Superb maths skills are a must in astrophysics, and you must be prepared to take your specialisation to Phd level.
Be warned though it's a very hard career to get into and jobs are particularly scarce. Unless astronomy is your absolute passion, I suggest keeping it as a hobby and doing something else as a career. Astronomy has the great benefit of being one of the few sciences were amateur/hobby astronomers can still contribute a large volume of excellent research.
Be warned though it's a very hard career to get into and jobs are particularly scarce. Unless astronomy is your absolute passion, I suggest keeping it as a hobby and doing something else as a career. Astronomy has the great benefit of being one of the few sciences were amateur/hobby astronomers can still contribute a large volume of excellent research.
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Until you have more experience in the field there is no reasonable answer. As you take advanced courses related to astronomy and begin to do some actual work in the field, you will begin to recognize what specialty you would like. There are several dozen available
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Astronomy and Physics.