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Across
  1. 3. The time it takes a planet to complete one full orbit.
  2. 5. The separation between two objects that affects gravitational force.
  3. 7. The force of attraction between two objects must be proportional to the objects' masses. (2 word answer)
  4. 8. The time required for an object to complete one full orbit. (2 word answer)
  5. 11. This law states that the paths of the planets are ellipses. (3 word answer)
  6. 13. This scientist measured the gravitational force between two objects.
  7. 14. This law states that an imaginary line from the Sun to a planet sweeps out equal areas in equal time intervals. (3 word answer)
  8. 16. The inward force that keeps an object moving in a circular path. (2 word answer)
  9. 17. The tendency of an object to resist changes in its motion.
  10. 19. The force that pulls objects toward Earth's center, giving them an acceleration of 9.8m/s^2.
  11. 20. Newton's law stating that every mass attracts every other mass.
  12. 21. The speed of an object in a specific direction.
  13. 22. This scientist developed the law of universal gravitation.
  14. 23. The amount of matter in an object.
  15. 24. The scientist who discovered the three laws of planetary motion.
  16. 26. The star at the center of the solar system that planets orbit.
Down
  1. 1. This law states that the square of the ratio of the periods of any two planets revolving about the Sun is equal to the cube of the ratio of their average distances from the Sun. (3 word answer)
  2. 2. All objects are surrounded by this and it affects the motions of other objects.
  3. 4. A push or pull that can change an object's motion.
  4. 6. That's what G stands for in 6.67 x 10^-11. (2 word answer)
  5. 9. The force of attraction between all objects that have a mass.
  6. 10. Mass as used in the law of universal gravitation is a quantity that measures an object's response to gravitational force. (2 word answer)
  7. 12. The rate at which velocity changes due to gravity.
  8. 15. An object that orbits a planet or larger body.
  9. 18. The path that one object follows as it moves around another object.
  10. 25. An oval-shaped path followed by planets around the Sun.