They actually carry atomic clocks in them.
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Aerospace is a field that encompasses the design, development, testing, and production of aircraft, spacecraft, and related systems and equipment. It combines aspects of both aeronautics (the study of flight and the design of aircraft) and astronautics (the study of space travel and the design of spacecraft). Key areas within aerospace include: 1. **Aeronautics**: This involves the study and design of airplanes and other vehicles that travel within Earth's atmosphere.