univers cross word puzzle

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Across
  1. 1. is the force that pulls to earth’s surface
  2. 2. dwarf planet
  3. 5. eighth planet from the son
  4. 7. is a gas that is poisonous to humans and is found on other planets
  5. 8. forth planet from the son
  6. 9. explained heliocentric first
  7. 11. a planet that has a core a mantel and a crust
  8. 17. seventh planet from the sun
  9. 18. supported heliocentric by looking at the moons of Jupiter
  10. 19. third planet from the sun
Down
  1. 1. is when the earth is at the center of the solar system
  2. 3. is when the sun is at the center of the solar system
  3. 4. fifth planet from the sun
  4. 6. first planet from the sun
  5. 10. supported heliocentric with gravity
  6. 12. is when the further something is from something the faster it will move away
  7. 13. sixth planet from the sun
  8. 14. objects in space that is more then ten meters that are found in between mars and Jupiter
  9. 15. second planet from the sun
  10. 16. explained that the planets orbit around the sun in an ellipse