Dynamics and Space

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Across
  1. 1. The third rock from the sun!
  2. 3. Numerical tools used in physics and maths.
  3. 6. An increase in speed.
  4. 8. The moon does not have one of these.
  5. 9. A push or pull.
  6. 11. Opposes motion.
  7. 12. The distance light can travel in a year.
  8. 13. A natural satellite.
  9. 15. The physics term for speed.
  10. 16. A vast cloud of gas and dust which could become a star.
Down
  1. 2. Needed to measure the length of the running track.
  2. 4. The unit of force.
  3. 5. To reduce air resistance on an object.
  4. 7. When forces are equal and opposite.
  5. 10. An object with so much gravity that light cannot escape.
  6. 13. The name of our galaxy.
  7. 14. The American organisation for space exploration (abbreviation)