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Last updated on May 20, 2013 at 8:18 EDT
Plancks cooling system composite
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Planck’s cooling system composite

May 26, 2009
In order to achieve its scientific objectives, Planck's detectors have to operate at very low and stable temperatures. The spacecraft is therefore equipped with the means of cooling the detectors to levels close to absolute zero (-273.15º C), ranging from about -253 º C to only a few tenths of a degree above absolute zero.