Even worse, as we are part of the universe, we would need to simulate ourselves and the very simulation that we are creating. You would also need to replicate the simulation of the simulation, leading to an eternal loop that would demand infinite matter and time (and would still not be enough!). Probably, you can't simulate something while being part of it.

It doesn’t need to be our universe, just a universe.

The question is, are the people in the simulated universe real people? Do they think and feel like we do—are they conscious? Either answer seems like it can’t possibly be right!