After working their way through the game's main story, Starfield players will eventually find themselves at the Unity, where they'll be met by a version of themself from some parallel universe. Their interdimensional doppelganger will explain that walking into the glowing ball of light behind them will lead to a brand-new adventure, although will offer very little information as to what this new adventure actually entails.
Starfield: Should You Walk Into the Light? (One Giant Leap)
As they near the end of their adventure, Starfield players will get the chance to walk into eternity, which takes the form of a glowing ball of light.