Unit 9 Review

Edit Answers
1234567891011121314151617
Across
  1. 3. theory that the universe began with a large explosion and has been expanding ever since
  2. 10. determines the length of a day
  3. 11. causes the earth to have seasons
  4. 13. theory that the earth is in the center of the solar system
  5. 14. the universe is 13.7 ______ years old
  6. 15. moon phase during a solar eclipse
  7. 16. season that occurs when the hemisphere is titled towards the Sun
  8. 17. moon phase that occurs when the moon is furthest from the sun
Down
  1. 1. theory that the sun is in the center of the solar system
  2. 2. eclipse that occurs during a full moon
  3. 4. two factors determine gravity's strength: ____ and mass
  4. 5. determines a year; a planets trip around the Sun
  5. 6. without this force, planets would fly off into space
  6. 7. proposed heliocentrism
  7. 8. objects in motion stay in motion
  8. 9. moon phase with only a sliver of light
  9. 12. eclipse that occurs during a new moon when the moon creates a shadow on earth's surface