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Last updated on April 18, 2014 at 1:21 EDT
Plancks cooling system at 4 degrees Kelvin
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Planck’s cooling system (at 4 degrees Kelvin)

May 26, 2009
To achieve the mission goals, the Planck instruments - the Low Frequency Instrument (LFI) and the High Frequency Instrument (HFI) - will operate at a few degrees above absolute zero. To achieve this, a series of cooling stages are required.

The picture shows the second cooling stage which brings the temperature inside HFI down to 4K.