The term 'Aerospace Prefix' is a crossword solution that consists of the word 'Astro', which has five letters. The prefix 'Astro' is commonly used in aerospace engineering and refers to anything related to outer space, such as astronomy, astrology, and astrobiology. It is also used to describe objects in space, such as asteroids, comets, and stars. In addition, it is often used to refer to spacecraft and other technology related to space exploration.