Outer space

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Across
  1. 3. the star we see at daytime
  2. 4. a planet's satellite
  3. 5. move around something, like a moon
  4. 7. star from a star
  5. 8. what earth is
  6. 10. the study of outer space
  7. 12. a person who studies Astronomy
  8. 13. the biggest star we know
Down
  1. 1. what a supernova causes
  2. 2. a star's explosion
  3. 6. international Space Station
  4. 9. what kepler-22b is
  5. 11. how many moons mars has