Maybe we are in a simulation. And to save processing power, only the stuff near the solar system is actually simulated. The light from other stars is just appro

Maybe we are in a simulation. And to save processing power, only the stuff near the solar system is actually simulated. The light from other stars is just approximated. Like in a render program, where ambient light often is not raytraced but just approximated. Then there might be no other stars and habitable planets out there. What we see is just the ambient light approximation of the simulation.