Astronomy

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Across
  1. 1. one complete orbit around another object
  2. 3. an object that orbits the Sun made of frozen water and dust
  3. 5. the force of gravity at the surface of the Earth or other celestial body
  4. 10. zone of weak gravity
  5. 14. amount of matter in an object
  6. 15. a rocket-launched spacecraft, able to land like an unpowered aircraft
  7. 16. force of attraction between two objects due to their masses
  8. 17. an artificial body placed in orbit around the earth or moon
Down
  1. 1. a cylindrical projectile that can be propelled to a great height or distance
  2. 2. a large artificial satellite used as a long-term base for manned operations in space.
  3. 4. the path that one object in space follows as it revolves around another object in space.
  4. 6. the spinning of an object on its axis
  5. 7. rocky planet, composed primarily of silicate rocks or metals
  6. 8. an unmanned exploratory spacecraft designed to transmit information about its environment
  7. 9. force exerted on an object by gravity
  8. 11. The measurement of forces acting on an object and are in the form of a push or pull.
  9. 12. a small, rocky body that orbits the Sun
  10. 13. A gravitationally bound system of the Sun and the objects that orbit it
  11. 14. a small piece of matter from outer space