GALILEO'S TELESCOPE AT 400: From Spyglasses to Hubble

Beyond Galileo's Telescope
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Galileo wasn't the only 17th-century scientist making his mark on the telescope. In 1671 Sir Isaac Newton developed a new version of the instrument (pictured) that used mirrors instead of lenses to focus the light from distant objects.

Newton's reflecting telescope got rid of the halo of light surrounding target objects that had plagued lens-based telescopes. His new design also allowed telescopes to do the same work with shorter bodies. (Explore a telescope time line.)
—Image by Hulton Archive/Getty Images
 
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