people are moving between the inside of buildings to walking around outside on the planet surface to flying in to space, to flying in a gas giants atmosphere and from there back inside building, then back out in to space to a giant gas cloud and in to a huge space station, back out again to fly to another planet at the speed of light in to the atmosphere and eventually the surface of yet another planet.............................. all that, billions of KM without a single loadscreen on a GTX 1070.
Its just code, its programming, its the engine, its software