Coolest spacecraft ever in orbit around L2

(PhysOrg.com) -- Last night, the detectors of Planck's High Frequency Instrument reached their amazingly low operational temperature of -273°C, making them the coldest known objects in space. The spacecraft has also just entered its final orbit around the second Lagrange point of the Sun-Earth system, L2.

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<p><a href="http://www.physorg.com/news165839026.html">Coolest spacecraft ever in orbit around L2</a></p> <p>(PhysOrg.com) -- Last night, the detectors of Planck's High Frequency Instrument reached their amazingly low operational temperature of -273°C, making them the coldest known objects in space. The spacecraft has also just entered its final orbit around the second Lagrange point of the Sun-Earth system, L2.</p>