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From Bullets to ‘Bird Residue,’ the Many Trials of Telescopes

Por: The New York Times Science April 18, 2023

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Few things in science appear to be as delicate or precarious as the giant mirrors at the hearts of modern telescopes. These mirrors — doughnuts of glass meters in diameter, weighing tons and costing millions of dollars — are polished within a fraction of a wavelength of visible light into the precise concavity required to gather and focus starlight from the other end of the universe.When not at work, they are sheltered in lofty domes that... + full article



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