[Balgair]

Whenever these discussions on mega structures come up I feel compelled to mention the ratios of mass-energy in the universe.

~5% of the universe is made up of the stuff you and I are. Most of that is hydrogen and helium, cooking in stars.

~20% of the universe is dark matter. We know very little about it except that it falls down.

~75% of the universe is 'dark energy'. I use quotes because we know almost nothing about it except that it seems to fall up (!?).

Give us another 500 years and who knows what the %s will look like. We could be missing dozens of whole categories still.

So when talking about aliens and hyper civilizations, I'm on the side that we know too little to even properly speculate. Like goldfish stuck in a pond.

That said, yeah, it's suuuuper fun to speculate about this stuff. I enjoy it a lot too.