Wait, so there are thousands of galaxies, all of them inside a cloud of relatively dense, incredibly hot gas? And it also contains a very energetic source of energy in the middle?
I'm imagining a boiling ocean, covered in volcanoes, with a nuclear bomb going off in the middle of it.
Well, "relatively dense and incredibly hot gas" in this context means "still indistinguishable from vacuum without sensitive sensors, even if you were immersed in it".
I'm imagining a boiling ocean, covered in volcanoes, with a nuclear bomb going off in the middle of it.