Astronomy and Light

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Across
  1. 2. you can use this to see warm things
  2. 6. a spectrum that includes light
  3. 8. the study of stars
  4. 9. can be dangerous; some animals can see it
  5. 10. a radiation used in hospitals
  6. 11. white light
  7. 12. a vibration in air or water
Down
  1. 1. the study of the universe
  2. 3. the radiation with the longest wavelength
  3. 4. the Greeks called this 'photo'
  4. 5. the frequency used by Radars
  5. 7. the most dangerous radiation