Coolest spacecraft ever in orbit around second Lagrange point
Saturday, July 4, 2009 - 07:42
in Astronomy & Space
On 2 July, 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, or L2...