NASA's new $8.8B telescope

NASA is preparing to launch its best space telescope yet, and it will gaze at the stars through a golden mirror. It's not a single piece, but an array of 18 segments made of beryllium -- a rare metal that is both strong and light -- and coated with a microscopically thin layer of pure gold for maximum reflectivity. It spans a whopping 21 feet (6.5 meters) across.

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