[xelasnave]

They are out there, apparently up to 20 billion solar masses, maybe larger,
Past the event horizon how much is known.
It seems the consensus suggests a singularity where the matter resides ..infinitely small and infinitely dense.
Is that view a math construct only or is it sciences view of reality.
I find it impossible to imagine 20 billion solar masses compacted to a point smaller than the head of a pin.
I could imagine an object of some reasonable size having the mass observed but to suggest something infinitely small seems unrealistic.
What is at the core of a black hole?
Do scientists believe to find a singularity or something more akin to a pulsar..