# What happens at the moment black hole is created?

Suppose a body has just enough matter in it that just 1 more electron could turn it into a blackhole. When this happens, where does all that matter go?

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We can trace the path followed by infalling matter by integrating the line element $ds$ along the trajectory. The problem is that at the singularity the curvature becomes infinite and it isn't possible to integrate any farther. This is the notorious problem of geodesic incompleteness. It's hoped that some future theory of quantum gravity will remove the singularity and allow us to find out what happens to the matter hitting it.