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Observatory
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===Airborne observatories=== {{main|Airborne observatory}} [[File:SOFIA with open telescope doors.jpg|thumb|[[Stratospheric Observatory for Infrared Astronomy|SOFIA]] on board a [[Boeing 747SP]]]] Airborne observatories have the advantage of height over ground installations, putting them above most of the Earth's atmosphere. They also have an advantage over space telescopes: The instruments can be deployed, repaired and updated much more quickly and inexpensively. The [[Kuiper Airborne Observatory]] and the [[Stratospheric Observatory for Infrared Astronomy]] use airplanes to observe in the [[infrared]], which is absorbed by [[water vapor]] in the atmosphere. [[High-altitude balloon]]s for X-ray astronomy have been used in a variety of countries.{{citation needed|date=March 2024}}
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