Astronomy

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Across
  1. 2. the distance between two peaks of a wave
  2. 4. the measurement used for something too big to fit in your bedroom
  3. 6. the type of radiation that is visible (light)
  4. 7. the study of the universe
  5. 9. the time it takes for light to travel in one year
  6. 10. all wavelenghts of electromagnetic radiation travel at a constant ___
  7. 13. astronomers use different parts of the electromagnetic ___ to study the universe
  8. 15. the height of a wave
Down
  1. 1. a simplified representation of a real system used by scientists to study the universe
  2. 3. the unit used to measure distances across our solar system
  3. 5. the measurement used for something you could hold in your hand
  4. 7. the abbreviation for astronomical unit
  5. 8. astronomers use different types to study the universe
  6. 11. the measurement used to measure one town to the next
  7. 12. the number of wavelengths passing a given point
  8. 14. a group of stars