Across
- 1. an object designed to produce some directional motion when in movement relative to the air.
- 3. space flights that use rockets to place payloads into orbit.
- 5. the lowest region of space above the earth in which spacecraft and satellites operate.
- 7. rockets that use a powder or spongelike mixture of fuel and oxidizer.
- 10. the last layer of space above the earth that blends directly into outer space.
- 11. a type of space travel represented by communication satellites and space shuttles.
- 14. aviation industry that makes money by transporting people and cargo in airplanes
- 15. a vehicular system that produces a force to propel the vehicle from its starting point
- 16. rigid airships with metal frames covered with skins of fabric
Down
- 1. the farthest distance away from the earth.
- 2. rockets with two tanks. One contains the fuel, and the other contains oxygen.
- 4. the layer that extends from 22 to 50 miles (35 to 80 km) above the earth.
- 6. the point at which an orbit comes closest to earth.
- 8. the force that holds or lifts a craft in the air. It is critical for all flight.
- 9. a type of orbit in which a satellite travels the same speed the earth is turning.
- 12. the body of an aircraft that contains the flight crew passenger, and cargo units.
- 13. a space flight that carries human beings into space and returns them safely to the earth.