Isaac Newton

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Across
  1. 2. Force applied over a distance
  2. 5. A way to test scientific ideas
  3. 7. Where you can observe stars and planets
  4. 8. Speed in a given direction
  5. 9. Newton developed a famous one about gravity
Down
  1. 1. Force responsible for keeping planets in orbit
  2. 3. Distance traveled per unit of time
  3. 4. The path a planet follows
  4. 6. A large object that orbits a star
  5. 7. Newton was a famous one of these