3 ms·

> a zero mass rock A what, now?

• amluto 1y ago
  That's kind of the point. It's true that, in the Schwartzchild metric, an object falling into a black hole would seem to take forever to fall in. And one can start making various extrapolations about what happens if you throw a whole lot of grains of dust in and how those grains of dust would pile up at infinite density near the event horizon. But once you notice that the Schwartzchild metric doesn't actually include these grains of dust and that it only really makes sense if the dust has zero mass, zero energy, etc, then the extrapolations are less interesting (look, infinite density of zero-energy things!). You need at least a perturbed Schwartzchild metric that accounts for the effect of the things falling in, and that might get different answers.