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Inside the most ambitious ground telescope ever built

from Popular Science

Telescopes have always had one major problem: The Earth's atmosphere bends light, distorting images. That's why telescopes are often built at high altitudes, where the atmosphere is thinner, and why NASA put Hubble in space. But space scopes aren't perfect. They're a compromise by definition. Now, increasingly sophisticated adaptive optics that adjust for the atmosphere's blurring effect are making many telescopes on Earth as good as anything that we could put in the sky. more

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