Astronomy!!!

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Across
  1. 2. Largest planet in our solar system
  2. 5. The study of the stars is called
  3. 6. Name of a famous telescope in space
  4. 8. Fourth planet from our sun
  5. 9. Galaxy that we live in
  6. 10. Mankind grouped stars in these (usually named after a living thing or a myth)
  7. 14. A dwarf planet in our solar system
  8. 15. The amount of time it takes for a planet to complete a turn on its axis
Down
  1. 1. Planet that is closest to our Sun
  2. 3. The amount of time is takes for a planet to travel around a its star
  3. 4. Gravitationally bound group of stars
  4. 7. Instrument to look at the stars and planets
  5. 11. Violent explosion of a star
  6. 12. Third planet from our Sun
  7. 13. The people who study the universe are called