I'm not a physicist, in any way. But I've had this idea about the universe for a while, and I would like to get some feed back on it. I have this idea that the Big Bang wasn't necessarily all of the matter in the universe. That just like matter accumulates and will eventually reach a sufficient mass to turn into a star or turn into a black hole, matter will accumulate into a sufficient mass to trigger a Big Bang. But this isn't all the matter in the universe. The accumulation of matter only has to be enough to trigger a Big Bang explosion. I understand that light can't escape a black hole. So it makes sense to me that, perhaps, this accumulation of matter had sucked in all the matter from such a wide area that we are now flying through the vacancy that its gravity created before it exploded. And light from outside this vacancy hasn't had enough time to reach us. And I also understand that part of the necessity for dark matter is that we seem to be expanding quicker than we could otherwise explain. Perhaps it is because there is actually gravity out there from matter outside our Big Bang that is pulling us towards it. Again, I'm not a physicist. The idea, though, where our Big Bang represents all the matter there is has always struck me as unnecessarily extreme, given the way we know matter otherwise tends to accumulate to the point that it triggers events (stars, black holes). We could have a Big Bang without it necessarily being all the matter in a much larger universe.