Across
- 4. spectrum showing frequencies/wavelengths of radiation
- 7. shortest wave length
- 9. uses a set of lenses to gather & focus light
- 10. spin of the earth on its axis
- 13. movement of the earth around the sun
- 15. system for measuring long intervals of time
- 16. point where the sun is as far north or south as possible
- 17. average distance between Earth and sun (abbreviation)
- 18. equal hours of daylight and darkness
- 19. point closest to the sun
Down
- 1. point farthest from the sun
- 2. large collection of dust, stars and gas.
- 3. "below the red" longer wave than red light on spectrum
- 5. instrument that collects electromagnetic radiation for better observation
- 6. light that humans can see
- 8. study of the universe
- 11. "beyond the violet" shorter wave than violet on spectrum
- 12. group of stars organized into a recognizable pattern
- 14. uses a curved mirror to gather & focus light