optics / Physics / Quantum Mechanics / etc.

Why The Sky is Blue: Lord Rayleigh, Sir Raman, and Scattering

The Sky is the Daily Bread of the Eyes ~Ralph Waldo Emerson   At some point in his or her life, almost every child on Earth asks, “Why is the sky blue?” The question is so prevalent that, to me, it has come to represent the wonder that the world holds for a a child. Adults don’t ask such questions… at least, not unless they’re scientists. Part 1: John Tyndall In 1859, physicist John Tyndall thought he’d found the answer to the sky’s color. His studies of infrared radiation required him to use containers of completely pure air. He