Europe's Planck observatory has reached its operating temperature, making it the coldest object in space.
The observatory's detectors have been chilled to a staggering minus 273.05C - just a tenth of a degree above what scientists term "absolute zero."
Launched in May, Planck will survey the "oldest light" in the Universe.
Its detectors, or bolometers, should see detail in this radiation that offers new insights into the age, contents and evolution of the cosmos.
link: BBC NEWS | Science & Environment | Planck achieves ultra-cold state
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