Is space-time smooth or chunky?

What is the fundamental nature of reality? Is space-time — the four-dimensional fabric of our universe — ultimately smooth at the tiniest of scales, or something else? It seems impossible to measure, but with the power of advanced telescopes peering through billions of light-years of distance, researchers are beginning to look down. Deep down.
Read more: https://www.space.com/space-time-smooth-chunky-quantum-gravity.html?source=Snapzu