earth in space

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Across
  1. 2. it takes 165 days to orbit the sun
  2. 6. contains three states of water(solid,liquid,gas)
  3. 7. a greek scientist and a mathematition
  4. 8. two half of the earth
  5. 10. has the most circular orbit to all the other planets
  6. 12. it is polluting our atmosphere
  7. 15. is known as the red planet
  8. 17. a person who is trained to travel in space
  9. 18. is known as a dwarf planet
  10. 19. it is the size of an American football field and took 13 years to complete
Down
  1. 1. the smallest planet in the atmosphere
  2. 3. a type of radiation
  3. 4. invented the telescope
  4. 5. the largest planet in our solar system
  5. 9. day and night
  6. 11. the longest day each year
  7. 12. is known as a star
  8. 13. the first man to step foot on the moon
  9. 14. the coldest planet in our solar system
  10. 16. has a moon called titan