GALILEO'S TELESCOPE AT 400: From Spyglasses to Hubble

Beyond Galileo's Telescope
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Back on Earth, bigger and better optical telescopes have been rivaling space-based observatories for the sharpness of their cosmic vision, and Hawaii's Mauna Kea volcano is arguably the mecca of ground-based astronomy.

Thirteen telescopes sit within shouting distance atop the 13,780-foot-high (4,200-meter-high) summit, and a 14th--the massive Thirty Meter Telescope--is slated to open in 2018. (Examine the plans for the world's biggest telescope.)
— Photograph by Joe McNally, National Geographic Stock
 
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