If you see any visualization of the cosmos nowadays it is probably one of two: either computer generated effect or a stack of images from NASA public archive.
I absolutely love the idea of creating effect in camera, and especially when the process is simple and innovative and the results are worth the effort. Shanks FX used a mix of milk, food coloring and soap over a piece of glass. They then mounted a Canon 5DS and used the high speed burst mode to capture 2-4 photos per second, and combine them into a time-lapse. Alas it was too large of a file: