There's a hypothesis that we may already be a simulation in something analogous to a computer. It's entirely possible that we may be playing out your scenario right now and what a trip that would be.
Now such a simulation would of necessity be a product of intelligence, but another possibility exists and you can find more under "holographic universe". To oversimplify our reality may be emergent, a 3D projection of a higher 5 dimensional spacial reality. We're accidental"shadows on the wall", an interplay of "light and shadow", put in quotations because they are analogies, not literal equivalents. One might say interesting but not a thing which can be tested. Well... they're fixed constants which are set in stone in order for quantum theory to be a valid representation of our universe and one is the "Planck length" Again rather simply spacetime is not continuous. At an unimaginably small scale the ability to divide a physical line ends. So what again? There isn't a particle accelerator which could be made to examine things that small. Well... That's correct BUT if we a holographic projection the smallest scale would be "smeared" so as to appear larger. Not enough to measure directly, but in certain qualities of gravitational waves, which we are on the verge of measuring.
That's really interesting stuff.