Superlatives and planets

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Across
  1. 6. The superlative form of “tall”
  2. 7. The biggest star
  3. 9. The superlative form of “crazy”
  4. 10. The person who travels to space
  5. 12. We can see it at night shining in the sky
  6. 13. Where do we live?
Down
  1. 1. Very big objects in the sky
  2. 2. A planet with rings
  3. 3. A type of spaceship
  4. 4. The biggest planet
  5. 5. The red planet
  6. 8. The last planet in our galaxy
  7. 11. The hottest planet