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Radio window
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{{Short description|Region of the radio spectrum}} [[File:Atmospheric electromagnetic opacity.svg|thumb|Opacity of the Earth's atmosphere: the radio window spans larger wavelengths. ]] The '''radio window''' is the [[spectral region|region]] of the [[radio spectrum]] that [[atmospheric window|penetrate the Earth's atmosphere]]. Typically, the lower limit of the radio window's range has a value of about 10 [[Hertz|MHz]] (λ ≈ 30 m); the best upper limit achievable from optimal terrestrial observation sites is equal to approximately 1 THz (λ ≈ 0.3 mm).<ref>{{Cite book |last1=Condon |first1=James J. |url=https://books.google.com/books?id=vWWYDwAAQBAJ |title=Essential Radio Astronomy |last2=Ransom |first2=Scott M. |date=2016 |publisher=[[Princeton University Press]] |isbn=978-0-691-13779-7 |pages=1 |language=en}}</ref><ref>{{Cite web |title=1 Introduction‣ Essential Radio Astronomy |url=https://www.cv.nrao.edu/~sransom/web/Ch1.html |access-date=2021-12-27 |website=www.cv.nrao.edu}}</ref> It plays an important role in astronomy; up until the 1940s, astronomers could only use the [[visible spectrum|visible]] and [[infrared|near infrared]] spectra for their measurements and observations. With the development of [[radio telescope]]s, the radio window became more and more utilizable, leading to the development of [[radio astronomy]] that provided [[Astrophysics|astrophysicists]] with valuable observational data.<ref>{{Cite book|last1=Wilson|first1=Thomas|url=http://www.worldcat.org/oclc/954868912|title=Tools of Radio Astronomy|last2=Rohlfs|first2=Kristen|last3=Huettemeister|first3=Susanne|publisher=[[Springer Science+Business Media|Springer-Verlag GmbH]]|year=2016|isbn=978-3-662-51732-1|location=Berlin|pages=1–2|language=English|oclc=954868912}}</ref>
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