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Across
  1. 2. the point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
  2. 5. He became the first person that used a telescope to observe the sky
  3. 6. he is known for his laws of planetary motion
  4. 7. he was a key figure in the philosophical revolution known as the Enlightenment.
  5. 8. The shape of a planet's elliptical orbit is defined by...
  6. 9. the point in the orbit of a planet, asteroid, or comet at which it is furthest from the sun.
  7. 10. is a unit 1AU=1496x10high 8km
Down
  1. 1. the apparent background movement of a plate is called
  2. 2. colliding particles in the early solar system merged to form...
  3. 3. he formulated a model of the universe that placed the Sun rather than Earth at its center.
  4. 4. is an oval shape Centered on 2 points