Earlier quoted context omitted.
> all without any loading screens It's like Elite: Dangerous or Minecraft. There are all kinds of loading screens, but they're all pretty cleverly hidden. On planetary surfaces, you can see chunks load as you drive or fly towards surface features. Every teleport is a loading screen. So is entering and exiting a vehicle, landings and takeoffs, entering/dropping from NMS's equivalent of supercruise, or warping to other…
In order to have a realistic, but reasonably playable space game, you need one of 1. Distances compressed, 2. Time compressed, 3. Unrealistic speeds KSP uses [1] (scaled down solar system) and [2] (user-controlled time passage), although [1] can be modded away by using a realistic solar system mod. Elite:Dangerous uses [3] (warp drives). I've never played NMS but it sounds like they use [1] and maybe [3]?
They may have also used [1] for NMS. I don't think it really matters, given the game play, to be honest.