univers crossword puzzle

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