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