re: Two lifeforms merge in once-in-a-billion-years evolutionary event

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Are some singularities bigger than others? Are they made of different things? I don't know this shite man!

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Hey man, I don't know this shite either, but I'm sure we can get through it if we want to!

We can measure the mass of a black hole in a very similar way that we measure the mass of a nearby star or even your own body - measure the effects of gravity and do the math.

As for the size, first we'll have to figure out what size even means when space itself is ripped apart. Is there even a meaningful difference between assuming that the volume enclosed by the event horizon is of uniform density vs. a dimensionless point singularity with infinite density at the center of an event horizon? In either case, density can only be calculated if volume is defined, and the volume of a black hole can only be defined by its event horizon.