"Since Einstein's general theory of relativity requires that gravitational fields and space-time be one and the same mathematical objects, this means that space-time itself is also subject to the kinds of uncertainty required by quantum systems. This indeterminacy means that you cannot know with infinite precision BOTH the geometry of space-time
, and the rate of change of the space-time geometry
, in direct analogy with Heisenberg's Uncertainty Principle for quantum systems.
Wheeler imagined that this indeterminacy for space-time required that at the so-called Planck Scale of 10^-33 centimeters and 10^-43 seconds, space-time has a foaminess to it with sudden changes in its geometry into a wealth of complex shapes and textures....
The problem is that we have no evidence that 1) gravity is a quantum field and 2) that space-time has this type of structure at these scales. -- source
Everyone is entitled to his own opinion, but not his own facts.