Galileo's telescope on historic visit to Philly

(AP) -- Though it looks like a cardboard tube that got left out in the rain, it's a priceless instrument whose owner changed the world. The mottled brown cylinder on display at The Franklin Institute science museum is a 400-year-old telescope used by Galileo Galilei, whose observations of the heavens ultimately changed the face of not only astronomy but all of science.

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<p><a href="http://www.physorg.com/news157914581.html">Galileo's telescope on historic visit to Philly</a></p> <p>(AP) -- Though it looks like a cardboard tube that got left out in the rain, it's a priceless instrument whose owner changed the world. The mottled brown cylinder on display at The Franklin Institute science museum is a 400-year-old telescope used by Galileo Galilei, whose observations of the heavens ultimately changed the face of not only astronomy but all of science.</p>