On the Shoulders of Giants

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Across
  1. 5. A harbinger of doom
  2. 7. The Water of Life
  3. 10. Person who determined Heliocentric solar system with CIRCULAR orbits of planets
  4. 14. A modern day Elixir of Life using Sassafras root
  5. 15. This religion punished Galileo
  6. 17. Stone that holds the Elixir of Life
  7. 19. Predicted the return of his comet
  8. 20. Missing his nose, but his observations of Mars were critical to others
Down
  1. 1. Equal and ____________ reaction (law of motion)
  2. 2. Latin term for an Earth centered solar system
  3. 3. A body at _________ has a tendency to stay motionless
  4. 4. Modern day Elixir of Life
  5. 6. Many periodic comets come from this region of the Solar System
  6. 8. Person who determined planet orbits were ELLIPSES
  7. 9. Planet responsible for protecting Earth from many comet collisions
  8. 11. Math invented by Newton to predict locations of planets
  9. 12. A comet that returns regularly is called a ________ comet
  10. 13. Turning worthless metal into gold
  11. 16. Adds the concept of Gravity to exactly order the movement of Solar System objects
  12. 18. Committed Heresy by turning a telescope to the heavens