Across
- 3. Very accurate clock for navigation.
- 7. Orbiting above one point on Earth.
- 9. Person who travels in space.
- 11. Air and space travel.
- 13. Tool to measure altitude (height).
Down
- 1. Tricks and stunts done by aircraft.
- 2. Person who travels in space (used mainly in Russia).
- 4. A vehicle that glides on water.
- 5. How air moves around objects.
- 6. A tool to see far away.
- 8. Tool to measure speed.
- 10. Sending measurements from far away.
- 12. Study of space and stars.