Astronomy

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Across
  1. 3. Last stage of the life cycle of a star
  2. 5. makes up 27 percent of the universe
  3. 6. you can physically touch dark matter(true or false)
  4. 8. The reasoning behind dark matters name
  5. 11. the universe is always __________
  6. 12. dark matter can't be destroyed unless they ______ together
  7. 14. have a positive charge in an atom
  8. 15. the universe is held together by _______
  9. 17. dark matter has a ________________ effect on visible matter
  10. 18. makes up 70 percent of the universe
  11. 19. everything in the universe is made of _____
Down
  1. 1. we only understand 3 percent of the ______ in the universe
  2. 2. have a negative charge in an atom
  3. 4. have no charge in an atom
  4. 7. during the life cycle of a star after red supergiant
  5. 9. first to propose dark matter
  6. 10. a subatomic particle that carries a fractional electric charge
  7. 13. dark matter doesn't interact with the _____________
  8. 16. a huge collection of gas, dust, and billions of stars and their solar systems