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