The Lunar Meteoroid Impacts Observer, Lumio, from Politecnico di Milano; TU Delft, EPFL, S[&]T Norway, Leonardo-Finnmeccanica and the University of Arizona would be a single 12-unit CubeSat carrying a sophisticated optical instrument detecting visible light flashes on the far side, caused by meteoroid impacts, to complement existing nearside monitoring, to build up a global lunar meteoroid environment model. Lumio was one of the two winners of an ESA General Studies Programme SysNova contest to design CubeSat missions to the Moon.