Charged (Reissner-Nordstrom) Black Holes
The charged black hole, as is illustrated above, is exactly like the static hole, with one exception: it has two event horizons.
Double Horizon
Scientists by the names of Reissner and Nordstrom (after whom this type of black hole is named) developed a theory, with mathematical solutions, that when a small charge is added to a black hole, the original event horizon shrinks and another horizon appears just above the singularity. If more charge is added, the outer horizon continues to contract and the inner horizon expands. If a charge is added equal to the black hole's mass (a very large amount of coulombs, needless to say) the two horizons merge into one. If the charge exceeds this value, the horizons disappear, leaving a naked singularity.
The event horizons still serve to flip time and space in a charged hole, but since there are two, the first will flip the axes once, and the second will flip them back to normal again. This is interesting, because it makes the singularity a point in space, not time, and theoretically this point should now be avoidable. This fact becomes more important when it pertains to rotating black holes.
Speaking of which...
On to Rotating Black Holes!
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