Earth and Sun

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Across
  1. 2. to turn on an axis
  2. 4. a time in the morning when the sun appears over the horizon
  3. 7. the measurement of the amount of matter in something
  4. 9. the phase of the moon when all of the sunlit side of the moon is visible from Earth
  5. 13. the star in the center of the Solar System
  6. 14. one of the four planets that are made of gas.
  7. 15. to reduce in volume by applying pressure
  8. 16. a huge region beyond the gas giant planets, made up of different sized chunks of matter
  9. 17. the shape of the moon when it appears to be more than a quarter but not yet full and when it is less than full but not quite a third quarter
  10. 18. the layer of gases surrounding Earth
  11. 21. an imaginary line around which a mass, like a planet, rotates
  12. 22. the phase of the moon when the sunlit side is not visible from earth
Down
  1. 1. anything that takes up space
  2. 3. curved shape of the visible part of the moon before and after a new moon
  3. 5. the force of attraction between masses
  4. 6. a phase of the moon halfway between a new moon and full moon
  5. 8. A system of the sun and other objects that orbit the sun
  6. 10. cycle the four week period during which the moon orbits Earth one time and is visible in all of its phases
  7. 11. a large, round object orbiting a star
  8. 12. a mass of ice, rock, and gas orbiting the sun
  9. 19. the force exerted by an object or fluid on something
  10. 20. the time between sunrise and sunset