The science case and challenges of spaceborne sub-millimeter interferometry: the study case of TeraHertz Exploration and Zooming-in for Astrophysics (THEZA) - Gurvits, L.I.; Paragi, Z.; Amils, R.I.; van Bemmel, I.; Boven, P.; Casasola, V.; Conway, J.; Davelaar, J.; Díez-González, M.C.; Falcke, H.; Fender, R.; Frey, S.; et al. (Proceedings of the International Astronautical Congress, IAC, 2021)