"The search for planets outside of the solar system, related to the question ""are we alone in the universe?"", is undoubtedly one of the main science drivers for the current design of telescopes and astronomical instrumentation. In this FP7 project, we will study the birth-places of such exo-planets, the so-called protoplanetary discs, by combining multi-wavelength space data (HERSCHEL, XMM, HST,...