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" Far infrared (15,000 nm to 1,000,000 nm): Produced by cold objects (think "liquid nitrogen" cold) and by specialized scientific equipment. Not much practical use."
I think 'not much practical use' should be changed to 'used heavily in star formation astronomy' or something similar as a number of telescope facillities use exactly this wavelength range. e.g. http://en.wikipedia.org/wiki/Atacama_Large_Millimeter_Array http://en.wikipedia.org/wiki/James_Clerk_Maxwell_Telescope http://en.wikipedia.org/wiki/Atacama_Pathfinder_Experiment
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" Far infrared (15,000 nm to 1,000,000 nm): Produced by cold objects (think "liquid nitrogen" cold) and by specialized scientific equipment. Not much practical use."
I think 'not much practical use' should be changed to 'used heavily in star formation astronomy' or something similar as a number of telescope facillities use exactly this wavelength range. e.g. http://en.wikipedia.org/wiki/Atacama_Large_Millimeter_Array
http://en.wikipedia.org/wiki/James_Clerk_Maxwell_Telescope
http://en.wikipedia.org/wiki/Atacama_Pathfinder_Experiment