Photo of the day

Love this Wired gallery of photos of telescopes:

The Keck II telescope in Hawaii pioneered the use of lasers in telescopes. It uses a sodium dye laser that charges sodium atoms from left behind by meteors. That makes them light up, creating a fake star that helps astronomers better correct for visual distortions in the earth’s atmosphere.   Enrico Sacchetti

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About Steve Greene
Professor of Political Science at NC State http://faculty.chass.ncsu.edu/shgreene

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