<title>Very wide band telescope for Planck using optical and radio frequency techniques</title>

Abstract

Planck associated to FIRST is one of the ESA scientific missions belonging to the Horizon 2000 program. It will be launched by an Ariane 5 in 2007. Planck aims at obtaining very accurate images of the Cosmic Microwave Background fluctuations, thanks to a spaceborne telescope featuring a wide wavelength range and an excellent control of straylight and thermal variations.