What is that?

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Across
  1. 2. a place that contains all our planets and stars
  2. 8. usually a gift; filled with air
  3. 9. not from this planet
  4. 10. to misunderstand
Down
  1. 1. to wreck
  2. 3. a machine that is found in the air
  3. 4. the way each person looks at something
  4. 5. sphere shaped places that containing gasses or solids
  5. 6. unidentified flying object
  6. 7. green living things not on earth