AS300 Exploring Space: The High Frontier Chapter 1

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Across
  1. 2. German–born mathematician and astronomer,developed three laws of planetary motion
  2. 3. mass x acceleration
  3. 6. study of universe beyond Earth’s atmosphere
  4. 8. often referred to as father of modern astronomy
  5. 11. celestial body moving in elliptical orbit around a star
  6. 13. one of Galileo’s biggest achievements was the improvement of this instrument
  7. 14. occurs when the Moon’s rotation is very close to or on the ecliptic line
  8. 15. a planet’s farthest distance from the Sun
  9. 16. his research led to his laws of motion and gravity
  10. 17. model where Earth is center of the universe
  11. 20. 16th Century Polish astronomer who studied the idea of a Sun-centered model of the universe
Down
  1. 1. model where Earth, other planets orbit Sun
  2. 4. published special theory of relativity in 1905
  3. 5. the apparent displacement of an observed object due to a change in the position of the observer
  4. 7. a geometrical shape where each point on the shape is at the same total distance from two fixed points
  5. 9. tendency of an object to resist a change in motion
  6. 10. branch of philosophy dealing with the origin and general structure of the universe
  7. 12. Sun’s apparent path during the year
  8. 18. small circle in which the center of the circle moves around a larger circle
  9. 19. a planet’s closest approach to the Sun