Panajev2001a
GAF's Pleasant Genius
It is, it really is, but it is not all in memory being tracked by the processor at once. Its attributes are stored in some database and retrieved when the cell they are part of is fetched from memory. With each big cell being segmented by loading screens they do have time to load and unload objects.idk if you played it but the ability for the game to remember the specific actions you took on one of the planets you may visit once + 100 others is amazing.