Ancient Astronomy

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Across
  1. 2. English mathematician that established the laws of physics and gravity; he has three laws
  2. 4. German mathematician and astronomer that determined the shape of each planets orbit by triangulation
  3. 7. discovered the sun centered model to explain our solar system
  4. 8. radio detection and ranging
  5. 11. earth lays in the center of the universe
  6. 13. UNIT average distance from Earth to the sun
  7. 14. the time needed for the planted to complete one circuit around the sun
  8. 15. Italian mathematician and philosopher; embraced the invention of the telescope and revolutionized the study of astronomy
Down
  1. 1. early astronomical site located in England; very popular tourist attraction
  2. 3. the tendency of a object to keep moving in the same direction unless a force acts upon it
  3. 5. REVOLUTION the realization the the Earth is not the center of the universe
  4. 6. the explosion of a giant star
  5. 9. OF STARLIGHT a slight shift in the observed direction to a star
  6. 10. the study of the universe on the largest scales
  7. 12. flattened circle