Earth in Space Crossword Puzzle

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Across
  1. 2. The zone around a star where water can exist in all three common states of matter
  2. 4. North The direction to the north axial pole
  3. 8. A spheroid flattened at the poles
  4. 10. The tilt between the axis of rotation of an astronomical body and its plane of orbit
  5. 15. The projection of the Earth’s equator into space
  6. 16. An astronomical body that revolves around a larger astronomical body
  7. 17. The daily motion of the stars caused by the rotation of the Earth around its axis
Down
  1. 1. When a satellite has the same period of spin on its axis as its orbit
  2. 3. The direction to the north axial pole
  3. 5. The direction a compass points
  4. 6. One year. In astronomy this is the cycle of a body orbiting another body one time
  5. 7. In geology, the internal layering of a body
  6. 9. The periodic variation in sea level due to the combined effect of the Moon’s and the Sun’s gravity on Earth
  7. 11. One of the fundamental forces of nature. A companion force to the electric force
  8. 12. The path of an object that is moving around a second object or point
  9. 13. Winter, spring, summer, and fall
  10. 14. The passage of one celestial object in front of another