This is Space Engine, it's a virtual recreation of the known universe that you can explore and travel around without the use of a supercomputer.
It's the pet project of astronomer and programmer Vladimir Romanyuk and uses procedural generation to create stars, solar systems and nebulas based on what we know about them so far.
This method of creation explains why you don't need a computer the size of a small town to explore it, instead the world universe is created only within a certain radius of where you are, with objects then being brought into existence the closer you get.
It's a work in progress but even in this early stage it's a stunning world and Romanyuk has only just started, promising Oculus RIft support in the near future.
You can download Space Engine for free for Windows.