James Webb Space Telescope successfully passed final thermal vacuum test
NASA’s $8.8-billionJames Webb Space Telescope, the world’s largest and most expensive one, has successfully passed final thermal vacuum test, making its parts cleared for use in space. The 6.5-meter diameter telescope has 18 gold-coated mirrors and a tennis court-sized sun-shield to gather light and protect its instruments. The telescope set to launch in 2021. It took 20 years to build. James Webb Space
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