: Measurements suggest the universe is "flat" like an endless sheet of paper. This implies it may be infinite in extent , with no physical edge at all. 2. Beyond the Fabric of Space-Time
If the universe is finite, it doesn't necessarily have a "wall." Instead, it might be curved like the surface of a sphere. Beyond the universe
: In this model, if you travel in one direction long enough, you eventually end up back where you started . There is no "outside" because the fabric of space-time itself is all that exists. : Measurements suggest the universe is "flat" like