Crossword about space

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Across
  1. 2. The second largest planet in our Solar System
  2. 3. There may be aliens living on me
  3. 6. Its a bly sky looking planet
Down
  1. 1. The largest planet in our Solar System
  2. 4. The star we orbit
  3. 5. Its not a planet any more
  4. 7. Inhabital planet