No Man's Sky, based on procedural generation, the algorithmic way to build a universe, is a journey to forever. Not bad, not bad at all.
But No Man’s Sky is far more complex and sophisticated. The tens of millions of planets that comprise the universe are all unique. Each is generated when a player discovers it, and is subject to the laws of its respective solar systems and vulnerable to natural erosion. The multitude of creatures that inhabit the universe dynamically breed and genetically mutate as time progresses. This is virtual world building on an unprecedented scale.
Any questions? :)