Vocabulary and People 28.1

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Across
  1. 1. closest point to the sun in a planets orbit
  2. 4. furthest point from the sun in a planets orbit
  3. 6. the backward movement of planets
  4. 8. found the force of gravity
  5. 9. the point at which rays of light meet after reflected
  6. 11. an oval shape that is centered on two points
  7. 12. found that orbit is elliptical
Down
  1. 2. the shape uof a planet’s orbit
  2. 3. discovered the sun was in the center and not the earth
  3. 5. discovered the heliocentric theory
  4. 7. earths average distance from the sun
  5. 10. objects ranging from 1 kilometer to 100s of km in diameter