In Schwarzschild geometry, we often say that when $r<2M$, $r$ becomes timelike and $t$ becomes spacelike. While I understand that this refers to the metric and how it behaves for a radial worldline if r=constant or t=constant, I do not understand what physical consequences this might have. Would that mean that for a time-separation we'd have to measure dr? Would t take values of 1M, 1.5M etc?
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