In the sky...

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Across
  1. 3. The name of the Cristoforetti astronaut.
  2. 7. it' s similar to our Galaxy but it' s bigger.
  3. 8. the closest star, accept for the Sun.
  4. 10. the farthest Planet of the Solar System.
Down
  1. 1. Planet that is outside of the Solar System.
  2. 2. The star of our Solar System.
  3. 4. It's the surname of the first person went on the Moon.
  4. 5. it' s the most brillant star. It starts with letter S.
  5. 6. it' s the darkest thing in the sky.
  6. 9. is not a Planet because is too much small.