I'd just like to step in on a particular point here.

Sivason, I hope I didn't misunderstand, but did you mean that we aren't possibly in a simulation ourselves because our sun is a real one, not a simulated one, for example?
If so, I'm not sure of that. I mean, we see the sun and everything else, but it's all stimuli. Simulation can create stimuli in our circuit brain. Kinda like when you're dreaming, it would be all real and so on, not stimuli, but exactly real experience-wise. The brain interprets the messages that reach it. It never actually 'contacts' reality. Like the matrix.
I hope I didn't misunderstand.
But I'm sure this is much more complicated than that. Lol I feel like a simpleton . plus, we need to be able to test these hypothesis or else we won't really reach any point. Without experiment, most ideas, even if they sounded very very logical and 'backed up', they turn out to be wrong. But science solves that by hard work and experimentation, and that's why I love it so much, it works!