space and flight

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Across
  1. 3. A state of very weak gravity.
  2. 5. The mechanical coupling of two or more human-made orbiting objects.
  3. 9. A vehicle, missile, or aircraft which obtains thrust by the reaction to the ejection of fast moving exhaust from within a rocket engine.
  4. 11. A vehicle for driving over rough terrain.
  5. 13. The locus of all points in the plane at which the sum of the distances from a fixed pair of points is a given constant.
  6. 14. A vehicle designed for space flight.
  7. 15. The science of getting ships, aircraft, or spacecraft from place to place
Down
  1. 1. The part of the universe lying outside the limits of the Earth’s atmosphere.
  2. 2. A proposed explanation for an observation. An educated guess which forms a basis for a test.
  3. 4. A fixed or adjustable vane or airfoil affixed longitudinally to an aerodynamically or ballistically designed body for stabilizing purposes.
  4. 6. A chemical mixture that is burned to produce thrust
  5. 7. A bowl-shaped depression formed in the soft soil of the moon by the impact of a meteorite or other object.
  6. 8. A path described by one body in its revolution about another.
  7. 10. In the U.S., a person who rides in a space vehicle
  8. 12. Fine, greyish dust and soil that covers the surface of the moon. Formed by constant pounding of the surface by impacts, the regolith can be between 2 meters and 20 meters deep.