Space crossword

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Across
  1. 3. The middle of the hottest and coldest season of the year
  2. 5. Another name for a natural satellite
  3. 6. 5th layer of the sun
  4. 12. Collection of many solar systems and stars.
  5. 13. A main reason why we explore space
  6. 14. Planet with the fastest rotation
  7. 15. Word used to describe the brightness of a star or sun.
Down
  1. 1. Force that keeps the planets in orbit
  2. 2. Planet with a clockwise rotation
  3. 4. Estimated percent of the universe that has been explored (write the number out)
  4. 6. Phase in which the Moon is very small
  5. 7. Pathway that planets travel on
  6. 8. Word used to describe a stage of the Moon
  7. 9. Word used to describe the function of a telescope
  8. 10. 6th planet from the Sun
  9. 11. Name of the second man on the Moon
  10. 16. A Mars rover