What could be more fun than floating in space? According to NASA, salaries for civilian astronaut candidates are based on the federal government's general schedule pay scale for grades GS-12 through GS-13. Each person's grade is determined by academic achievements and experience. Currently, a GS-12 starts at $65,140 per year and a GS-13 can earn up to $100,701 per year. Military astronauts remain in an active duty status for pay, benefits, leave, and other similar military matters.Any adult who is in excellent physical condition and meets the basic qualifications can be selected to enter astronaut training. But for mission specialists and pilot astronauts, the minimum requirements include a bachelor's degree in engineering, science or math, followed by three years of related experience and preferably an advanced degree. Pilot astronauts must have at least 1,000 hours of experience in jet aircraft, and they need better vision than mission specialists.It's a tough field to get into. There are more than 4,000 applicants for about 20 openings every two years. But go ahead, fill out an application.