The successor to the Hubble Space Telescope is reaching some key milestones in its preparation for launch in 2018.
Engineers are about to complete the assembly of the primary mirror surface on the James Webb Space Telescope.
They are also winding up the final deep-chill calibration tests on the observatory's four instruments.
The US space agency-led project is now on track to make rapid progress in the coming months.
The major components of JWST, which have been years in the design and fabrication phase, will at last be integrated into their flight configuration.
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