History Crossword Puzzle

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Across
  1. 2. system of thought expounded by Rene Descartes is based on the belief that reason is the chief source of knowledge.
  2. 4. is one of Newton's three rules of motion; it explains that planetary bodies continue in elliptical orbits around the sun because every object is attracted to other objects by gravity
  3. 7. is any of the concentric, revolving, spherical transparent shells in which, according to ancient astronomy, the stars, sun, planets, and moon are set.
  4. 8. theory says knowledge is achieved by observations
  5. 9. Galileo Galilei invented this to make sure the sun is centered and used it to make other discoveries
  6. 10. Sun-centered system of the universe in which planets revolve around the sun
Down
  1. 1. person who studies and tries to explain the world; a scholar or a thinker
  2. 3. systematic procedure for collecting and analyzing evidence that was crucial to the evolution of science in the modern world
  3. 5. doctrine that scientists should proceed from the particular to the general by making systematic observations and conducting carefully organized experiments to test hypotheses or theories
  4. 6. Earth-centered, a system of planetary motion that revolves around the Earth