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7 Nov 97

Blue Skies...and not so Blue

When we flew home over the Rocky Mountains near Denver last week, we saw a surprising amount of snow on the ground. We continued over the Colorado River and had a great view across the canyon country towards the Grand Canyon way to the south. The sky was deep blue above, but definitely lighter blue close to the horizon. This effect is common, and I usually blame it on dust and smog. But I'm sure the desert air was clear and cold. So why is the sky less blue on the horizon? For that matter, why is it blue at all?


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Marc Kummel /