Seeing deep into space requires large telescopes. The larger the telescope, the more light it collects, and the sharper the image it provides. For example, NASA's Kepler space observatory, with a mirror diameter of under one meter, is searching for exoplanets orbiting stars up to 3,000 light-years away. By contrast, the Hubble Space Telescope, with a 2.4-meter mirror, has studied stars more than 10 billion light-years away. Now astronomers are proposing a space observatory that would have a primary mirror with a diameter of 100 meters -- 40 times larger than Hubble's. Space telescopes, which provide some of the clearest images of the universe,
via Science Daily
Zazzle Space Exploration market place
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