BIRB is keeping Webb cool.
This NASA image shows the deployment of the James Webb Space Telescope's secondary mirror out in front of its main mirror assembly.
The cool side"even has a radiator to keep it extra cool," NASA multimedia specialist Sophia Roberts said in the video. That radiator and everything except Webb's bright gold mirrors are black on that side, she explained. To ensure that the black paint used on Webb did the best job possible at soaking up and radiating heat away from the telescope's instruments, NASA used a special ultra-black paint made by Ball Aerospace called Ball Infrared Black .
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