GALILEO'S TELESCOPE AT 400: From Spyglasses to Hubble

Beyond Galileo's Telescope
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As telescope technology improved, scientists found ways to create ever larger designs. The 100-inch (254-centimeter) Hooker telescope at California's Mount Wilson Observatory first collected light from the heavens in November 1917. (See pictures of the next-generation telescopes at work today.)

The telescope's mirror helped astronomer Edwin Hubble--seen above looking through the telescope's eyepiece in 1937--to find new ways of measuring how far away objects are from Earth. Hubble's findings ultimately allowed him to confirm that the universe is expanding.
— Photograph by Margaret Bourke-White/Time Life Pictures/Getty Images
 
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