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Aerospace engineering encompasses the fields of aeronautical (aircraft) and astronautical (spacecraft) engineering. Aerospace engineers work in teams to design, build, and test machines that fly within the earth's atmosphere and beyond. Although aerospace science is a very specialized discipline, it is also considered one of the most diverse. This field of engineering draws from such subjects as physics, mathematics, earth science, aerodynamics, and biology. Some aerospace engineers specialize in designing one complete machine, perhaps a commercial aircraft, whereas others focus on separate components such as for missile guidance systems. There are approximately 71,500 aerospace engineers working in the United States.