MIRI carries detectors that need to be at less than 7 K to be able to detect longer wavelength photons of infrared light. This temperature is not possible on Webb by passive means alone, so Webb carries an innovative cryocooler, dedicated to the task of cooling MIRI’s detectors so that it can see farther into the infrared than the other instruments.
But MIRI’s cooler reuses its helium just like the refrigerator in your kitchen continuously recycles its own coolant. MIRI is inspected in the giant clean room at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, in 2012. Credit: NASA/Chris Gunn.
Nancy_A Your Kelvin/Celsius conversions are inconsistent...
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