Sun, Earth, Moon.

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Across
  1. 1. has alot of craters
  2. 4. To spin
  3. 5. the envelope of gases surrounding the earth or another planet.
  4. 6. What shape the planets are
  5. 12. To orbit
  6. 13. a celestial body orbiting the earth or another planet.
  7. 16. A imaginary line through the middle of a planet
  8. 17. Holes made by asteroids or meterors
Down
  1. 1. The different shapes of the lit portion of the Moon that can be seen from Earth
  2. 2. Where all our planets are
  3. 3. To fallow a path
  4. 6. The sun is the only
  5. 7. has human life
  6. 8. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
  7. 9. An imaginary line that goes through the center of the earth
  8. 10. One of the moon-phase
  9. 11. There are eight of these in our solar syestem
  10. 13. Big ball of gas.
  11. 14. the shell of a planet.
  12. 15. The force that attracts a body towards the center of the earth or any other mass-carrying physical body.