Astronomy

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