Space crossword puzzle

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Across
  1. 5. a rock that orbits the sun between Mars and Jupiter
  2. 6. the smallest planet also closest to the sun
  3. 7. the very last planet in our solar system
  4. 10. hits earth after entering the atmosphere
  5. 11. the only planet that we know can sustain life
  6. 12. the planet that scientists are currently studying
  7. 13. the largest planet in our solar system
Down
  1. 1. the hottest planet in our solar system
  2. 2. everything to ever exist and everything in it
  3. 3. sixth in our solar system with rings
  4. 4. a frozen ball of dust and ice
  5. 6. enters earths atmosphere, usually burns up
  6. 8. the only planet in our solar system to rotate sideways
  7. 9. a hot glowing ball of gas
  8. 10. has three stages