Solar system

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Across
  1. 3. period between a new moon and full moon
  2. 6. people who go out in space
  3. 9. is the closest planet to earth and the second to sun
  4. 10. heat released from sun in forms of
  5. 11. has moon triton
  6. 13. closest planet to sun
Down
  1. 1. largest planet in our solar system
  2. 2. shape of ellipse
  3. 4. first person to use telescope to study moon
  4. 5. period between full moon to new moon
  5. 7. instrument used to study space and stars
  6. 8. people who study planets
  7. 12. biggest star in our solar system