A doctoral degree is the usual educational requirement to become a Theoretical cosmologest. For pursuing a career in theoretical cosmology one may go through the science stream specially in physics and math's after plus two. After 12th, you have to complete 5 years of studies (3 years for graduation and 2 years master's degree) to pursue PhD. As a beginner in the research work, a junior can earn a monthly stipend of approximately Rs.10,000 per month.