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