Solar System

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Across
  1. 2. Darkest central part of the shadow
  2. 4. Change between high and low tides is least
  3. 6. Model, Earth is stationary while objects in the sky move around it
  4. 8. When Earth casts a shadow on the moon
  5. 9. outer solar system, large with low density
  6. 11. Model, Earth and planets revolve around the sun
  7. 12. Distance in space is measured with
  8. 14. Neil Armstrong was commander and first man on moon until Appolo 17
  9. 15. German mathmetician, determined the orbit of a planet is an ellipse
Down
  1. 1. Telescope from 1990
  2. 3. Change between high and low tides is greatest
  3. 5. solar system formed a rotating cloud of dust and gas Shock waves caused the cloud to collapse.
  4. 7. Planets would form from the outer part of the disk and sun from the center
  5. 10. When the moon casts a shadow on Earth
  6. 13. When a shadow of one body falls on another