The detail and physics alone are impressive. The scales from galaxy down to the lumps on the ground on a planet are seamless.
A comment from Youtube:
@Androeus It's even more 'gameplay footage' than one might think... I don't know if you know that the starfield background isn't actually background; it's a quasi-realtime render of the actual in-game galaxy. Every nebula is really there, and every dot is a star you can travel to, with its own planetary system