Enough to keep you entertained, but for a Bethesda game, it feels small. Only 4-ish cities you'll spend much time in. 100's of procedurally generated stars with nothing on them. The emptiness is by design, but remember poking around caves is Skyrim and finding side quests which lead to legendary loot? There's none of that here. Starfield wants you to play it's faction quests and story, then repeat, over and over. The games entire main story is bound to the concept of exploration, yet starfield gives me no incentive to.
"Whats out there?"
Nothing.