It's impossible to say what was "outside" the Big Bang because the Big Bang theory describes the origin of everything we can observe, including space and time itself.

Here's why:

* The Big Bang wasn't an explosion in space: It was the expansion of space itself from an extremely hot and dense state. Think of it like a balloon being inflated, where the surface of the balloon represents space and the inflation represents the expansion.

* There is no "outside" of space: We currently understand space to be everything that exists. If there were something "outside" of space, we wouldn't be able to define it or observe it because it would be beyond the realm of our understanding.

* The concept of "before" the Big Bang is meaningless: The Big Bang marks the beginning of time as we understand it. There is no "before" the Big Bang in the same way there is no "north" of the North Pole.

So, what about the "singularity?"

The singularity is a hypothetical point of infinite density and temperature that existed before the Big Bang. However, we have no way of knowing what happened at that point or what existed before it. The singularity is a theoretical construct, and its nature remains a mystery.

The Big Bang theory is a powerful tool for understanding the universe, but it doesn't answer all questions. The nature of the "outside" of the Big Bang remains a fundamental mystery.