Earth in Far-UV
On 21 April 1972, NASA’s Apollo 16 mission took a far-UV photo of Earth with a UV camera. The original black-and-white picture was printed on Agfacontour professional film three times, with each exposure recording only one light level. The three light levels were then colored blue (dimmest), green (next brightest) and red (brightest).
—Apollo 16 Far UV Camera, G. Carruthers, NASA
