The following movie shows the evolution of the gas and dark matter in the surrounding of a MW-like galaxy. What is really nice of this movie is that it shows the evolution of the galaxy with 4000 snapshots, interpolated from the parent simulation that sampled the process with only 100 snapshots. To give you an idea, 4000 snapshots implies a 4:30 minutes movie at 15 fps, 2:15 minutes movie at 30 fps, and so on. The result is quite impressive to me. Note, however, that some “features” are seen as soon as the galaxy disc forms. These are related to sampling issues. In addition, this technique enables to flight through the simulated volume as the galaxies form (see minute 5:00). Hope you enjoy the movie as I do.
Next image shows a composite of a real astronomical image, and a simulated galaxy (in the centre) from the APOSTLE project. Stars are rendered using Py-SPHViewer using their “actual” colours, calculated using GALAXEV.