Science crossword

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Across
  1. 3. long day
  2. 4. crazy particles
  3. 6. attracts without touching
  4. 10. creates heat
  5. 11. things that are big in space
  6. 14. moon of the day
  7. 15. pulls things down to the earth
Down
  1. 1. high and low
  2. 2. almost touching particles
  3. 5. tilt of the earth
  4. 7. very small element
  5. 8. the sun at night
  6. 9. winter, summer, spring, autumn
  7. 12. brushing past each other
  8. 13. little planets that are bright