So this void is 6 x 1021 miles long?
That's pretty large. Thankfully it isn't a black hole, because, if I remember correctly, black holes are dense enough that they contain the same amount of matter of earth in a cubic centimeter. I'm sure you can guess what that means if there were a black hole that large (yes it goes without saying it would really suck, but that's a bad pun, correct terminology would be it would really 'pull'.)
No, black holes are no more threatening than stars or groups of stars. Yes, they have more density concentrated in volume, but it's always the same mass. If our sun were to become a black hole (it pretty much can't, but let's talk theoretically), Earth wouldn't be sucked into it. We'd all die of lack of sunlight, but Earth would continue to revolve around the black hole just as it did the sun.
So a black hole of that size would have the same mass as a group of stars that would fill that space.
And also, THIS AREA HAS NO MASS. It can't be a black hole.