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Across
  1. 7. backward movement of a planet.
  2. 9. discovered gravity.
  3. 10. point in orbit of a planet, asteroids, or comet at which is furthest from the sun.
  4. 11. shape of a planets elliptical orbit
  5. 12. one of two fixed points used to define an elipse.
Down
  1. 1. 1.496x10 8
  2. 2. the point in orbit of a planet, asteroids, or comet at which it is closest from the sun.
  3. 3. oval shape that is centered on two points instead of a single point, as in a circle.
  4. 4. first person to use a telescope to observe the sky.
  5. 5. suggested the sun was the center of the solar system.
  6. 6. objects ranging from one km hundreds of km in diameter.
  7. 8. he demonstrated that planets orbit the sun called an elipse.