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.
원문출처 : https://www.cnn.com/style/article/james-webb-gold-mirror-style/index.html
원문출처 : https://www.cnn.com/style/article/james-webb-gold-mirror-style/index.html