[adorno]

how in hell do they know there are 18 billion?
Good questions. Also, why is the more "massive" black hole illustrated as a larger black cirlce and the smaller black hole as a smaller black circle. The way I understood black holes, all accretion goes into a singularity that is by all indications, smaller than an atom. So, shouldn't both black holes be illustrated as being the same size? Perhaps they need a different way of illustrating weight for celestial bodies.

[CarrotAndStick]

I thought blackholes had a difference in mass, depending on the amount of matter that went into it... more mass absorbed = more massive blackhole, with bigger gravity effects surrounding it.

[advertising guy]

that’s my understanding as well..........

[Centurion2000]

The way I understood black holes, all accretion goes into a singularity that is by all indications, smaller than an atom.

You are correct; the singularity is smaller than an atom, but what changes in radius based on mass will be the event horizon. The differences between the black holes will be their event horizons or where the orbital velocity required to maintain orbit exceeds the speed of light.

Get within the event horizon and you will never get back out.