I physics there’s the concept of event horizon.
In practice it encapsulates the beings in a sphere beyond which, due to expansion of time-space, light ( the fastest thing) will never reach.
This effectively limits one’s observable universe at any given point in time.
This horizon serve as an edge for causality.
Given that we are dependent originated streams aggregates of suffering, born of causation, I argue that event horizon serves as a limit to what we can affect with our choices and actions (including observing and knowing).
Hence, while it may be the case that an infinite amount of timespace stretches beyond or event horizon, for the sake of shared samsaric experience we may be stuck with those within the same “radius” of timespace.
The topics below may be interesting to understand the geometry of causality.
