The energy demands to simulate a universe at full detail make the simulation hypothesis unlikely according to some astrophysicists.

Astrophysicist Franco Vazza analyzed the energy requirements for simulating the entire visible universe or even a detailed Earth simulation. His work suggests that the available energy in our observable universe is insufficient to support such a large-scale, high-resolution simulation. This energy constraint challenges the practical feasibility of the simulation hypothesis, implying that if simulations exist, they might be limited in scope or resolution.