James Webb is in the process of cooling itself down even more - Universe Today by AndyTomaswick
Cooling things down in space is trickier than it might sound. But that is exactly the process the James Webb telescope is going through right now. Getting down to cryogenic temperature is imperative for its infrared imaging systems to work correctly. While the telescope has already started, it will be another few weeks before the process is complete, and it’s ready to start capturing its first groundbreaking infrared images of the universe.
The rest of the telescope’s instruments have been cooling since the sunshield was deployed several weeks ago. Even so, another hurdle to overcome is the lack of two of the three ways to get rid of heat naturally in space. Conduction, where heat is transferred directly to another substance, and convection, where new material at a lower temperature is continually cycled in front of the warmer material due to gravity, don’t work in the vacuum of space.
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