Solar System Review
Across
- 2. The wide, outermost layer of a star's atmosphere.
- 4. The distance light travels in 1 year (two words).
- 6. The true brightness of an object.
- 8. A large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.
- 12. A graph that plots luminosity vs. temperature of stars (2 initials and word).
- 13. A process that occurs when the nuclei of several atoms combine into one larger nucleus (two words).
- 16. Where hot gas moves up toward the surface and cooler gas moves deeper into the interior (two words).
- 17. The apparent surface of a star.
- 20. Theory that the universe began from one point billions of years ago and has been expanding ever since (3 words).
- 21. A cloud of gas and dust.
- 22. An object whose gravity is so great that no light can escape (2 words).
Down
- 1. A measure of how bright an object appears from Earth (two words).
- 3. The average distance between Earth and the Sun, about 150 million km (two words).
- 5. A hot, dense, slowly cooling sphere of carbon (2 words).
- 7. Matter that emits no light at any wavelength.
- 9. A shell of cooler hydrogen above a star's core (two words).
- 10. Huge collections of stars.
- 11. The orange-red layer above the photosphere.
- 14. The shift to a different wavelength (2 words).
- 15. Spreads light into different wavelengths.
- 18. An enormous explosion that destroys a star.
- 19. A dense core of neutrons that remains after a supernova (2 words).