Giant Telescopes of TomorrowIn the 20th century, telescopes advanced greatly in size, with apertures of optical scopes expanding from just five feet to over 30, and radio dishes growing from 30 feet across to 1,000. Discoveries kept pace: We have mapped the Milky Way with its 100 billion stars, for instance, and now accept that the universe has billions of galaxies, many anchored by a supermassive black hole at the center. But to address some of the most pressing cosmological questions today—what is dark matter? dark energy? is there life elsewhere?—space scientists agree that we need much bigger and much better eyes on the sky. In this slide show, see some of the giant optical and radio telescopes now under development.—Peter Tyson
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