Q&A: Black Holes

Q:
What if we, and everything that we have seen are inside of a very massive black hole and outside of it is a very unknown universe?

A:
We do not have direct information about what exists inside a black hole, but an expanding, sparsely populated, but clumpy Universe wouldn't be the first guess of astronomers. A black hole is an object containing so much mass concentrated in a relatively small space that light cannot escape. What would stop light escaping from our known Universe?