We think of infrared radiation as heat. More energy than radio but less than visible light, infrared radiation is emitted by warm clouds of dust and gas heated by nearby stars. Cool red stars, by far the most numerous type of star, emit most of their light in the infrared. In fact, almost everything in the universe, including people, is a source of infrared radiation.
Infrared in Space
7 years ago by cryptozone (40)
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