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The James Webb Space Telescope Has Emerged from the Freezer

Primary mirror James Webb Space Telescope

The towering primary mirror of NASA's James Webb Space Telescope stands inside a cleanroom at NASA's Johnson Space Center in Houston.

Credit: NASA

After spending three months at a temperature of just 20 degrees Celsius above absolute zero, the massive James Webb Space Telescope emerged from a large vacuum chamber at the end of 2017. Now, after reviewing data from testing done there, scientists have given the instrument a clean bill of health, moving it one step closer to space.

From Ars Technica
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