Coolest spacecraft ever in orbit around L2
Friday, July 3, 2009 - 10:42
in Astronomy & Space
(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.