Intresting - What's on Inside the Bubble?

Bubbles have been a puzzle for so long because it's hard to get data about what's going on inside of them. We think that probably what's happening is that that small amount of gas inside the bubble, is getting very rapidly compressed. But again, the details of how that generates these photons is not something we yet understand. Soif you try toke build a numerical simulation of what's goingon, we just don't really have physical laws that can tell us what's happening. And besides, i you don't even know what's inside of the bubble. It could be like a gas, or it could be like floating water molecules we don't understand.