Space and the galaxy

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Across
  1. 1. how many moons in our solar system
  2. 2. hottest constellation in the universe
  3. 4. largest planet
  4. 6. an ice giant and seventh planet from the sun
  5. 7. hottest planet in the solar system
  6. 10. how many planets in our solar system
  7. 11. coldest place in the universe
  8. 13. known as the red planet
  9. 15. closest star to the sun
  10. 17. approximately how old is the earth
  11. 18. the planet we live on
Down
  1. 1. shortest space flight
  2. 3. how many stars in the big dipper
  3. 5. this is in the center of the milky way
  4. 8. the smallest planet
  5. 9. what is the largest constellation
  6. 11. the planet farthest from the sun
  7. 12. what animal was first in orbit
  8. 14. second largest planet with rings
  9. 16. how many moons does Jupiter have