4 ms·

I just realized I was replying to the wrong parent comment! So sorry. I was talking about a PBS Space Time episode on YouTube I saw in (or came across via) a di

• codethief 8y ago
  No worries, I hadn't watched the video yet, anyway. :) So feel free to rephrase your questions if you like!
  • dsnuh 8y ago
    My questions were based in the video I linked above, which it sounds like may be incorrect in the way it presents the topic?
    • codethief 8y ago
      Judging from the few minutes I watched, it is at least not very precise, yes. What they mean when saying that "time and space switch roles inside a black hole" is that in standard Schwarzschild coordinates, the direction given by the time coordinate becomes spacelike at the event horizon and, likewise, the radial coordinate becomes timelike. This statement is specific to Schwarzschild coordinates, though, or, more generally, any coordinate system that is singular/ill-defined at the event horizon. There are coordinate systems, however, that don't exhibit this pathological behavior at the horizon and, there, no switching occurs.