https://www.youtube.com/watch?v=txlCvCSefYQ , https://www.youtube.com/c/DrBenMiles/videos
The nature of reality is fascinating and mysterious.
Trying to simulate the known universe is too complex and difficult still. Simulating a galaxy might still be too difficult.
A star or solar system is a little easier. However, simulating various worlds have become quite commonplace. Computer games and VR can certainly depict various scenarios, from the sublime to the horrific.
Perhaps if someone or something that is of a very advanced level of intelligence has been around for a very long time, they might have already created various cosmic scale simulations.
The Simulation Hypothesis & Free Will Explained by Brian Greene https://www.youtube.com/watch?v=LMneQsUw6XI , https://www.youtube.com/@ScienceTime24/videos
Are We Living in an Ancestor Simulation? ft. Neil deGrasse Tyson | Space Time https://www.youtube.com/watch?v=hmVOV7xvl58 , https://www.youtube.com/@pbsspacetime/videos
https://thedigitallabyrinth.blogspot.com/search?q=The+Simulation+Hypothesis