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James Webb Space Telescope completes its final phase

NASA’s largest-ever space telescope James Webb Space Telescope has completed its final phase of the 100-day vacuum testing at -266ºC. The tests included an alignment check of Webb’s 18 primary mirrors, to make sure the gold-plated, hexagonal segments act like a single mirror. The $8.8 billion telescope took 20 years to build.The cryogenic test phase