Planck
Planck, retour vers le passé
PLanck
An important European satellite launched with Herschel in 2009 ; it observed the well-known cosmic microwave background radiation, first radiation that came out of the universe some 400000 years after the Big-Bang, about 13 to 14 billions years ago.This radiation, has a temperature just below 3K (-270°C),. We tested the entire satellite for about 10 months just before it was send to Kourou. These tests were very delicate, the smallest temperature of the main detector being -273.05 °C, i.e. just 0.1 °C above the absolute zero.
updated on 11/8/19
