Across
- 6. the prevailing model of how the universe was created
- 8. Gravity forced ______ nuclei in their cores to fuse
- 12. much smaller than planets
- 14. when the cores of the stars collapsed, the outer layers also zoomed
- 15. the stars cores imploded, collapsing thousands of miles in just seconds from about the size of the Earth to about ______ mile in diameter
- 16. so dense that a single teaspoon of its material on Earth would weigh 1 billion tons
- 18. first scientist to argue that neutron stars might create heavy elements such as gold
- 19. a mixture of two or more metals
- 20. Proton has what kind of charge
Down
- 1. the unnamed stars thrived on
- 2. important pair of large stars formed and started circling each other
- 3. Neutron has what kind of charge
- 4. humans never laid eyes on the gold in
- 5. space rock that hit a planet's surface
- 7. soft, highly conductive, and doesn't corrode, making it suitable for use in electronics
- 9. the unit to express the percentage of pure gold in an alloy
- 10. pulls atoms closer together into swirling clumps of gas and dust
- 11. Karats misspelled
- 13. a science writer from Cleveland, Tenn
- 17. How many stars involved in the creation of gold thrived on nuclear fusion