Across
- 2. Cloud of gas and dust where stars are formed
- 5. Type of galaxy with arms that wind outward from the center
- 6. Radiation left over from the early universe that supports the Big Bang Theory
- 9. Change in wavelength showing that an object in space is moving away from Earth
- 11. Process by which stars are created from collapsing gas and dust
- 12. Theory that explains the origin and expansion of the universe
- 14. Extremely hot, dense state of the universe at the beginning of time
- 15. Force that pulls matter together and allows stars and galaxies to form
Down
- 1. Object with gravity so strong that not even light can escape
- 3. Process that powers stars by combining hydrogen atoms into helium
- 4. The stretching of space as the universe grows larger over time
- 7. Change in wavelength showing that an object in space is moving toward Earth
- 8. Early stage of a forming star before nuclear fusion begins
- 10. Most abundant element in the early universe and the main fuel of stars
- 13. Large system of stars, gas, and dust held together by gravity