history

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Across
  1. 1. Planetary motion and elliptical orbits
  2. 3. Used a telescope to observe outer space
  3. 5. Proposed the heliocentric model
  4. 7. Chemist associated with Boyle's Law
  5. 9. Newton's force of attraction
  6. 11. Measures air pressure
  7. 12. Earth-centered universe
  8. 13. Measures temperature
  9. 15. Sun-centered universe
  10. 16. Observation and experimentation
Down
  1. 2. Ancient supporter of geocentrism
  2. 4. "I think, therefore I am"
  3. 6. Instrument for observing space
  4. 7. Promoted empiricism
  5. 8. Instrument invented by Janessen
  6. 10. Astronomer whose observations helped Kepler
  7. 13. Invented the barometer
  8. 14. Developed laws of motion and gravity