The planets in No Man’s Sky are supposed to be, well, planet-sized. Most players will only see a small percentage of any locale, if that, before boredom sets in and another planet is explored. One man, however, has decided to undertake a pilgrimage that is testing the limits of his sanity, if not the limits of the planet generation itself.
Source: Kotaku – One Man’s Maddening Quest To Walk Across An Entire No Man’s Sky Planet