Reason for the Season

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Across
  1. 5. If we are facing away from the sun, the season is
  2. 9. is the old model with Earth in the center of the Solar System
  3. 11. we have THESE because of Earth's 23.5 degree tilt
  4. 14. this word means "half" like half of the Earth
  5. 17. when Earth goes around the Sun
  6. 20. when Earth spins on its axis
  7. 21. this celestial object revolves around the Earth and Sun
  8. 23. light hits the ground ______ when it is summer
  9. 24. light hits the ground ________when its winter
  10. 25. This is the hemisphere we live in
  11. 28. Earth's axis is _____
  12. 29. how long does an Earth rotation take?
  13. 30. which has more mass?: the earth, the sun, or the moon
Down
  1. 1. we have seasons because of Earth's ______
  2. 2. how long does a revolution around the sun take for Earth?
  3. 3. an invisible line through the north and south poles
  4. 4. third planet from the sun
  5. 6. this is the invisible line in the center of Earth
  6. 7. which has the least mass?: the earth, the sun or the moon
  7. 8. is our current model with the Sun in the center of the Solar System
  8. 10. study of space
  9. 12. is the path that the Earth takes when it revolves around sun
  10. 13. if we are facing toward the sun, the season is
  11. 15. the shape of Earth's orbit around the sun
  12. 16. our yellow star
  13. 18. This is the hemisphere we do not live in
  14. 19. another word for "rotation"
  15. 22. The sun's ______is the reason planets go around the sun
  16. 26. which has more gravity: the earth or the moon?
  17. 27. Earth's twin planet