PALANETIES

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Across
  1. 3. very early stage of a planet
  2. 6. icy object past Neptune
  3. 11. fragment from a celestial body on earths surface
  4. 12. earth-like planets made of rock
  5. 13. early stage of a meteor
  6. 14. multiple bodys passing one point
  7. 15. measuring circular bodys
  8. 16. region of interplanetary space
  9. 17. main constituent of gas planets
Down
  1. 1. made of helium or hydrogen
  2. 2. planet lacking requirements
  3. 4. oval shape
  4. 5. icy body that releases gas and has a tail
  5. 7. long cliffs on mercury's surface
  6. 8. area around a star capable of liquid water
  7. 9. rotational motion opposite to primary orbit
  8. 10. unit of measurement in space
  9. 11. celestial body that enters earths atmosphere