Planck satellite (artistic view) ? Group?objectives The cosmic microwave background (CMB) whose spectrum is a quasi-perfect black body is a fossil radiation from the first moments of the Universe. The APC laboratory is participating in the measurement of its anisotropies as part of the European Space Agency's (ESA) Planck space mission, which was launched on 14 May 2009. Planck will be able to measure temperature fluctuations with Angular resolution of the order of 5 minutes o...