wt subjects does one has to take in college to become an astronaut or to work for NASA?

Answer 1

No special classes. Just do well in school in general. Science and math are important, but perhaps not as important as you might think.

Answer 2

What NASA looks for (while selecting for astronaut candidates) is someone with science and math background. Doesnt matter whether you are in biological, chemical or physical sciences field. They need them all. You dont necessarily have to be a pilot unless you are planning to become a pilot astronaut. There are different types of astronauts. There are Pilot Astronauts (commanders & pilots), there are mission specialists and there are payload specialists. All are astronauts but each has a different function. You dont have to have prior flight training if you are applying for mission specialists.

In addition, little experience in the field of study, strong academics and an active life style are must because....take a look at any astronaut biodata and you will see a pattern. They all have good education, science or math field, and active life style (running, biking, jogging, surfing, or any other activity.) I am not saying you have to be a surfer or jogger, but just telling you about the importance of being fit and active.
Cocentrate on Math & Science.
For your information, there are astronauts that were biologists, doctors, electrical engineers, mathematicians etc.

Answer 3

If you want to be an astronaut, you'd be better off joining the air force. That's where most of them got their training.

If you want to work for NASA, they hire physicists, astronomers, engineers, computer programers, etc. Check out their job site (on their website) for other careers as well. If you want to be a physicist or astronomer, you'll need a Ph.D. to do any real work. That's 4 years of undergrad (physics major and math and astro majors/minors) and 4-7 years of grad school.