The Sun-Earth-Moon System (pgs. 300-303)

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Across
  1. 2. Both the Earth and the Moon have this kind of surface.
  2. 4. Earth contains this while the Moon doesn't.
  3. 5. A path that one object takes around another in space.
  4. 8. To move in an orbit.
  5. 9. The distance from one side of a circle to the other.
  6. 10. The Sun-Earth-Moon system is held together by this.
  7. 12. Earth spins 1,600 km/hr here.
  8. 13. A gas found in the Sun.
  9. 16. Gravity pull these toward each other.
  10. 17. Earth's atmosphere additionally contains this element.
Down
  1. 1. Another gas found in the Sun.
  2. 2. A space object spins in place like a top.
  3. 3. The Sun, Earth, and Moon have distinct features called _____ .
  4. 6. Takes 365 days for Earth to complete one of these.
  5. 7. Earth's atmosphere contains this.
  6. 11. Both the Earth and the Moon spin on this.
  7. 14. The moon takes this long to complete one rotation.
  8. 15. Earth's gravity pulls on this.