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Time and space are finite in extent, but they don't have any boundary or edge. They would be like the surface of the earth, but with two more dimensions.

Stephen Hawking
Two, Space, Would Be
Stephen W. Hawking (1993). “Black Holes and Baby Universes and Other Essays”, Bantam
Time and space are finite in extent, but they don't have any boundary or edge. They would be like the surface of the earth, but with two more dimensions.