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doublehelix
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His telescope is 400 years old today:
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(be sure to check out the photo gallery.)
Just over 400 years ago, Galileo--then chair of mathematics at Italy's University of Padua--got word that Dutch glass makers had invented a device that allowed viewers to see very distant objects as if they were nearby.
The mathematician soon acquired a Dutch instrument, and on August 25, 1609, he presented an improved, more powerful telescope of his own design to the senate of the city-state of Venice.
More.
(be sure to check out the photo gallery.)