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## Main Question or Discussion Point

I am puzzled. Please help me out. Thanks.

If we cross the horizon of Schwarzschild black hole horizon, we know that r becomes to timelike.

Why the fututre is direction of decreasing r rather than increasing r?

If we cross the horizon of Schwarzschild black hole horizon, we know that r becomes to timelike.

Why the fututre is direction of decreasing r rather than increasing r?