Although the data from satellites such as Herschel and Gaia provide a new insight into how stars form, it can still be tricky to piece together the history of an individual region. The observations see only a snapshot in time of a process that can take millions of years. Computer simulations can help us understand how clusters form, evolve and eventually disperse, giving us insights as to the history of our observed objects. The group at Cardiff University is tasked within StarFormMapper to run these computer simulations, and is making use of a new, state-of-the-art astrophysics simulation-code called Arepo. The simulations are able to follow how gravity brings together gas in the interstellar medium, and turns this gas into the dense cores where stellar clusters form. The images below show a snapshot from the simulation and reveal the different physical properties of the gas that the simulation is able to trace.