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Questions regarding points of extremely high mass density, which creates an extremely strong gravitational field from which light cannot escape.
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How can a black hole have a charge, or be charged?
I have to correct my answer written here before. The Reissner-Nordström metric has the shape (see https://de.wikipedia.org/wiki/Reissner-Nordstr%C3%B6m-Metrik):
\begin{equation}
\mathrm{d}s^2 = -\left …