The CMB gives a snapshot of the universe when, according to standard cosmology, the temperature dropped enough to allow electrons and protons to form hydrogen atoms, thus making the Universe transparent to radiation.
Med njimi so: DASI, WMAP, BOOMERanG, QUaD, Planck, Atacamski kozmološki daljnogled (ACT), Južnotečajni daljnogled (SPT) in QUIET.