Infrared telescopes .28700 nm.2F 0.7 .C2.B5m .E2.80.93 1000 .C2.B5m.2F1 mm.29 History of the telescope

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although infrared radiation absorbed atmosphere, infrared astronomy @ wavelengths can conducted on high mountains there little absorption atmospheric water vapor. ever since suitable detectors became available, optical telescopes @ high-altitudes have been able image @ infrared wavelengths. telescopes such 3.8-metre (150 in) ukirt, , 3-metre (120 in) irtf — both on mauna kea — dedicated infrared telescopes. launch of iras satellite in 1983 revolutionized infrared astronomy space. reflecting telescope had 60-centimetre (24 in) mirror, operated 9 months until supply of coolant (liquid helium) ran out. surveyed entire sky detecting 245,000 infrared sources—more 100 times number known.







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