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In page Infrared astronomy:
"Infrared astronomy began in the 1830s,[citation needed] a few decades after the discovery of infrared light by William Herschel in 1800.[1] Early progress was limited, and it was not until the early 20th century that conclusive detections of astronomical objects other than the Sun and Moon were made in infrared light.[citation needed] After a number of discoveries were made in the 1950s and 1960s in radio astronomy, astronomers realized the information available outside the visible wavelength range, and modern infrared astronomy was established.[2]
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