[poconopundit]

The astronomers tell us relatively with high precision that the black hole is 100,000 times the size of our Sun. Yet that is located about 25,000 light years away.

I did a little calculate and found that 100,000 times the diameter of our Sun is 86 billion miles.

Well, at the speed of light, it would take a mere 5 Earth days for light to cross that diameter.

So my question is: why isn't the diameter of this black hole known with greater accuracy?

If the distance away is give-or-take a few hundred light years (5.9 trillion miles each), how can they tell us so precisely that the diameter of this black hole is 86 billion, give-or-take a few billion years?

[poconopundit]

Sorry, my question is really about the lack of accuracy of the distance away.

Why is the diameter so relatively accurate compared to the very imprecise “about 25,000 light years away”?

Sorry I didn’t check this over better.