Answered by Robin2868 Monday Feb 11th 2008

NASA's space program does indeed accept civilians for astronaut training as well as military pilots and personnel. According to their website, they accept candidates who have a four-year degree from an accredited school in either math, biological science, engineering, or physical science.

In addition to a degree, you'll also need at least three years of work experience in the sciences related to your major. The program prefers candidates with advanced degrees and will let a Master's or Ph.D stand as a substitute for work experience. They also encourage teachers to apply, and will consider teaching experience as equivalent to work experience in a "related" field.

Check out NASA's website for more information:
http://www.nasajobs.nasa.gov/astronauts/content/broch00.htm