| To his surprise, he found that this region had the highest temperature of all | |
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| […] He found that the temperatures of the colors increased from the violet to the red part of the spectrum | He directed sunlight through a glass prism to create a spectrum […] and then measured the temperature of each colour |
[…] Herschel decided to measure the temperature just beyond the red of the spectrum in a region where no sunlight was visible.
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