I read this great article recently titled “The Physics of Extraterrestrial Civilizations” by Dr. Michio Kaku. It had a very interesting perspective on advanced physics, based on the possibilities + limitations known to modern physics.
Power and engineering seem to be the things that define where this hypothesis goes.
Some of the interesting points classify types of advanced civilizations.
How to explore the Galaxy.
How soon it could be. If we avoid extinction, we should reach advanced status within a few hundred years.
All these things together made for some very interesting reading.