Historical Models of the Universe & Kepler's Laws

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Across
  1. 3. An imaginary line sweeping from the sun to a planets orbit creates "slices" which have equal ______ during an equal period of time.
  2. 6. Kepler's 2nd Law is known as The Law of ______.
  3. 7. Brahe invented astronomical instruments that were the most _______ until the telescope was invented.
  4. 10. The shape of a planet's orbit.
  5. 12. Aristarchus was the first to propose a _______ model of the universe.
  6. 14. Describes the amount of "flattening" of an ellipse.
  7. 15. A planet orbits the slowest at this point on its orbit.
  8. 16. Galileo's powerful telescope allowed him to identify four _____ of Jupiter.
  9. 19. From the earth's point of view, it may appear that a planet's location loops backward and then forward. This is called ________ _______.
  10. 22. Kepler's 3rd Law is known as The Law of ______.
Down
  1. 1. 9.296 x 10-7th power equals one ______ _____.
  2. 2. The apparent "loop" that a planet makes from the earth's point of view takes place when the earth ______ the other planet
  3. 4. Newton proposed that the force of _________ kept the planets in motion around the sun.
  4. 5. P-squared = a-cubed describes the relationship between a planet's _____ and average_____ to the sun.
  5. 8. A model of the universe with the earth at its center.
  6. 9. The acronym listing the planets from the smallest to largest orbit. (Including Pluto)
  7. 11. He believed that the universe was made up of 4 elements: earth, air, water and fire
  8. 13. His model included aspects of both Aristarchus and Ptolemy.
  9. 17. Aristotle proposed a geocentric "spheres within spheres" model containing a 5th element: _______.
  10. 18. each elliptical orbit has two of these, with the sun placed at one of them.
  11. 20. a small circle whose center moves around the circumference of a larger one.
  12. 21. Kepler's 1st Law is know as The Law of _____.