Coolest spacecraft ever in orbit around L2
3 Jul 2009, 13:11 UTC
ESA (Image by AOES Medialab)
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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