Cosmological Astrophysics - It's birthday of #Johann_Wilhelm_Ritter, the man who discovered the #Ultraviolet_Light In 1801, after hearing about the discovery of heat rays (#infrared radiation) by #William_Herschel (in 1800), Ritter looked for
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Applied Sciences | Free Full-Text | How Infrared Radiation Was Discovered—Range of This Discovery and Detailed, Unknown Information
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