A singularity is a black hole's core. A singularity contains all the mass of the black hole and can literally swallow everything (except for a bigger black hole). This means it is very dense.
Using this information, please solve this question: How dense is the singularity if it can contain everything except for a black hole bigger than it's size?
Ignore side effects like the objects orbiting around the black hole instead of destroying the object.
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Contrary to the statements here, the black hole does not "eat" everything else. A planet can safely orbit around a black hole, without being swallowed.