  It is shown that quantum uncertainty of motion in systems controlled mainly
by gravity generally grows with orbital timescale $H^{-1}$, and dominates
classical motion for trajectories separated by distances less than $\approx
H^{-3/5}$ in Planck units. For example, the cosmological metric today becomes
indeterminate at macroscopic separations, $H_0^{-3/5}\approx 60$ meters.
Estimates suggest that entangled non-localized quantum states of geometry and
matter may significantly affect fluctuations during inflation, and connect the
scale of dark energy to that of strong interactions.
