Lecture 11: Radiometry and Photometry (57)

The idea of a standard candle is also very prevalent in astronomy, where astronomers use stars of known brightness to calculate the distance of the star and nearby celestial bodies from earth. See more: https://en.wikipedia.org/wiki/Cosmic_distance_ladder


Not very relevant to this course, but there's a fascinating Planet Money episode about the history of artificial light and its economic consequences! https://www.npr.org/sections/money/2014/04/25/306862378/episode-534-the-history-of-light

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