Herschel produced unparalleled wide-field images of the dust continuum emission, revealing a remarkable, filamentary structure of the dense galactic ISM. These images lack, however, the velocity information that is needed to understand fully the 3D motions of the molecular gas within the filaments. The new FIR facilities, notably SOFIA, as well as the future balloon and space missions, such as GUSTO or OST, will soon be able to fill this gap, focusing on the unique aspects of the FIR.

SOC :

Darek Lis (LERMA), Maryvonne Gerin (LERMA), Edith Falgarone (LERMA ; TBC), Edwin Bergin (U. Michigan), William Langer (JPL/Caltech), Jan Tauber (ESA)