The Cosmic Vision 2015-2025 foresees an all-sky cosmic microwave background (CMB) polarisation mapper.
Temperature fluctuations in the CMB will be measured by the Planck satellite from 2007 onward. Planck will provide a map of the CMB field at all angular resolutions greater than 10 arcminutes and with a temperature resolution of the order of one part in a million.
A 4th generation CMB satellite optimised for polarization and with a total sensitivity roughly 50 times greater than Planck is required to address three fundamental science goals:
Technology Readiness Target: 2010