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Webb’s Coldest Instrument Reaches Operating Temperature
MIRI, the mid-infrared camera and spectrograph (left), was installed in the science payload module of the James Webb Space Telescope (right) on 29 April 2013 at the NASA Goddard Space Flight Center. (Credit: NASA/Chris Gunn)

PARIS (ESA PR) — With help from a cryocooler, Webb’s Mid-Infrared Instrument has dropped down to just a few degrees above the lowest temperature matter can reach and is ready for calibration.

The James Webb Space Telescope will see the first galaxies to form after the Big Bang, but to do that its instruments first need to get cold – really cold. On 7 April, Webb’s Mid-Infrared Instrument (MIRI) – a joint development by ESA and NASA – reached its final operating temperature below 7 kelvins (minus 266 degrees Celsius).


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