Studying Space Vocab

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