A system of seven protostars embedded in an accretion disk was spotted in the high-mass star forming region NGC 6334IN. This is the first time such a high number of nascent stars is observed embedded in a disk, showing how the mechanism of disk fragmentation contributes to the multiplicity of massive stellar systems. In order to confirm disk fragmentation as the most likely mechanism to produce the observed distribution of protostars, the researchers compared the data against 3D radiation-gravito-hydrodynamical simulations of disk fragmentation.