find out the impossible

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Across
  1. 2. on it side
  2. 5. the center
  3. 7. hottest
  4. 8. system big
  5. 9. the smallest
  6. 11. tomato
Down
  1. 1. the coldest
  2. 3. the biggest
  3. 4. the biggest
  4. 6. bigger
  5. 8. the one with the rings
  6. 10. the one place has life