Far Infrared
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Far infrared astronomy must be done from high-flying aircraft because?
1. far infrared sources are very bright.
2. none of the above
3. far infrared telescopes are not very heavy.
4. far infrared radiation is absorbed low in Earth's atmosphere.
5. far infrared photons are quite energetic.
5, you need something that is also energetic to be able to pick them up.
Portable Far Infrared Sauna
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