What Is Spacetime?

Answer 1

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A 4 dimensional manifold with 3 dimensions of space and 1 dimension of time. Its metric is

dS^2 = dx^2 + dy^2 + dz^2 - dt^2

Notice the minus sign before the time term. This is the only thing that makes time different from space.

Answer 2

It is a name for the first 4 dimensions.

Answer 3

Spacetime = space + time. Or mathematically, space^2 - time^2.

Answer 4

Trust me. Just look it up.