Paul Sutter finishes his article with, "But still, that's nothing to sneeze at, and it means that blackholes are frighteningly common."
Frighteningly common, yes, but so are trash trucks, sewage lines, and cargo and passenger conveyances. The event horizons of blackholes are mightily multi-dimensional, truly elastic space-time warps (and as such may also be stargates, benign and/or malignant). I'm not talking its singularity / singularities, if it has them, which would be in any case paralleling universe terminus of one kind or another from out of an elastic space-time warp. No, I'm talking the differing planes of gravitational space-time warp nearing and/or at and along the bends, the curvatures, of the event horizons themselves that could hurl, or just take, travelers out of the space-time of that particular blackhole to some other space-time somewhere (into one end of a particle quantum entanglement to the other end identical particle and out, possibly benignly enough depending on the launching pad-plane, and other end terminus pad-plane, traveled in practically no space-time flat. It need not be a flat horizontal terminus of space-time, it could be a vertical terminus of space-time, or both in one multi-dimensionality.
So such a multi-dimensional possibility being so "frighteningly common" need not necessarily be so altogether frightening.
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