In 1800 William Herschel discovered “invisible light” It's energy with all the same characteristics as visible light, but is not sensed by the human eye. - ppt download
Earth Shaker - #AstroOTD | On this day in 1738, British-German astronomer Sir William Herschel was born. Friedrich Wilhelm Herschel was a British-German astronomer and the founder of sidereal astronomy for the