Build a Twilight Photometer
This ultra-sensitive device detects the altitude of dust, smoke, and volcanic emissions high in the sky
Written and photographed by Forrest M. Mims III 
Illustrated by James Burke
HAVE YOU WONDERED WHY SOME SUNSETS ARE SO SPECTACULAR AND OTHERS SO DRAB? This ultra-sensitive photometer project will allow you to tease out the secrets of twilight and even do serious science by finding the altitude of the dust, smoke, and air pollution that influence the colors of twilight.
With this project you can detect the tiny particles ...
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