The Earth and other planets

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Across
  1. 3. the closest planet to the sun
  2. 6. the outer planets are made up of this
  3. 7. it is made up of huge gases which burn all the time producing heat and light
  4. 9. An imaginary line passing through the Earth from the north pole to the south pole
  5. 12. The movement of the Earth on its axis
  6. 13. It is the coldest planet in our solar system
  7. 14. The movement of the Earth around the Sun in an fixed orbit
  8. 15. It is called the red planet
  9. 16. It is the dwarf planet
Down
  1. 1. A piece of rock from outer space that burns completely on entering the earth's atmosphere
  2. 2. The largest planet
  3. 4. A natural object revolving around a planet
  4. 5. The definite path around the sun on which planets orbit
  5. 7. A big planet surrounded by rings made of ice and dust
  6. 8. It is called the morning and evening star
  7. 10. It is called the water planet
  8. 11. A bluish-green planet