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Becoming an astronaut requires tremendous amount of effort. To start with, after finishing your tenth grade, you must start focusing on your career. You should opt for Science stream from 11th standard. After completion of 12th you may concentrate on obtaining a solid bachelor's degree from a reputable University or College.  To pursue further study in the disciplines of Astronaut or Scientist, you must first get a bachelor's degree in engineering, biological sciences, physical sciences, computer science or mathematics. A bachelor's degree in astrophysics is a great place to start for aspiring astronauts. Astrophysics is a multidisciplinary field that encompasses physics, chemistry, mathematics, and cosmology.