Astronomers and their models

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Across
  1. 1. proved the moons of jupiter did not go around Earth
  2. 3. a geometric figure with an eccentricity of zero
  3. 4. the path of a planet around the sun
  4. 6. a geometric figure with an eccentricity of one
  5. 9. heliocentric model, with elliptical orbits
  6. 11. discussed that gravity keeps the planets near the sun
  7. 12. theory of how the solar system formed
  8. 13. technology that enabled Galileo to see the moon's surface
  9. 14. first scientist to state the heliocentric model
Down
  1. 2. the mathematical method of calculating the shape of an ellipse
  2. 5. earth-centered model of the solar system
  3. 7. sun-centered model of the solar system
  4. 8. he took precise observations, which helped Kepler develop his theory
  5. 10. concept of the origin of the universe