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