SCORE ONE FOR GRANDSON—On a recent visit grandson #2 asked
question #2719 during his two-day stay. Funny,
could have sworn his dad asked the same question in 1977. Back then I probably answered:
“Because it is! Well, it isn’t. To find out why the sky is blue I rushed to NASA.gov website for a
fascinating answer.
Go to link: http://scijinks.nasa.gov/blue-sky
Quick answer: NASA says the sky is blue because light
coming from the sun is always white, but when it hits the atmosphere of earth
it is reflected, bent or scattered much like light passing through a
prism. Blue isn’t scattered or changed
as easily because it has a low wavelength.
Blue light waves get absorbed by the gas molecules in the atmosphere
then spit out in all directions. Human
eyes see the blue easier until sunset when the angle of the setting sun allows
red wavelength of light to pass through the atmosphere more easily.
Image: http://www.flickr.com/groups/979018@N23/
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