The primary goal of these experiments was to measure the angular scale of the first acoustic peak, for which COBE did not have sufficient resolution.
Najbolj znan je verjetno Nasin satelit Cosmic Background Explorer (COBE), ki je delovcal v letih med 1989 in 1996, in, ki je zaznal in določil anizotropije na velikih razdaljah v okviru svojih zmogljivosti.