Across
- 3. way to describe the Milky Way galaxy
- 5. distance from crest to crest in a wave
- 8. an area in space so dense that light cannot escape
- 10. - an object spins on its axis
- 11. a ball of ice and dust orbiting the Sun with 2 tails
- 14. one object moving around another object
- 16. produces energy in a star
- 18. what determines the life cycle of a star
- 20. theory that the universe began from a small, dense point and expanded outward
- 21. area just past Neptune, comets originate here
- 22. A rocky mass that enters Earth's atmosphere and hits Earth's surface
Down
- 1. found between Mars and Jupiter
- 2. large planets found past the asteroid belt
- 4. what our Sun will become when we no longer have hydrogen to fuse
- 6. state of matter of the Sun
- 7. A streak of light from a rocky mass burning up in Earth's atmosphere.
- 9. model of solar system with the Sun in the center
- 12. radiation that has shorter wavelengths than violet, can cause cancer
- 13. rocky, smaller planets close to the sun.
- 15. radiation from the Sun that can be broken down to individual colors
- 17. published a sun-centered model shortly before his death
- 19. radiation that feels like heat