James Webb Space Telescope successfully passed final thermal vacuum test

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  • NASA’s $8.8-billion James 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.


  • It is planned to be the successor to the Hubble Space Telescope.
  • It will provide greatly improved resolution and sensitivity over the Hubble and will enable a broad range of investigations across the fields of astronomy and cosmology.
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