science

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Across
  1. 2. a group of many solar systems and stars,planets
  2. 4. the largest planet in are solar system
  3. 6. negative charge
  4. 7. the atmosphere we live on
  5. 8. a pull force
  6. 9. everything we know of
  7. 11. is a land that is wet most of the year
  8. 13. a ball of gas and ice and has a trail
  9. 16. a ball of gas in are solar system
  10. 19. water vapor
  11. 20. positive charge
Down
  1. 1. spinning in place
  2. 3. when water falls back on earth
  3. 5. earths sister planet
  4. 10. going around
  5. 12. everything is made up of them
  6. 14. salt and fresh water mix
  7. 15. neutral charge
  8. 17. condensed water vapor
  9. 18. a natural satellite