| 1 | A laser beam can be used to up-convert infrared light to visible light. | |
| 2 | Humans have no direct perception of infrared rays unlike the rattlesnake which has receptors tuned into wavelengths longer than 0.7 micron. | |
| 3 | The images combine infrared and visible light to increase the contrast between water and land. | |
| 4 | The present day interstellar dust isweighed by measuring the intensity and color of emission at longerinfrared wavelengths. | |
| 5 | The reflected light was found to be missing infrared wavelengths that are absorbed by water molecules. |
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