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In the last decade or so there has been debate over the possibility that thefuzzy quantum nature of spacetime might decohere wavefronts emanating from verydistant sources. Consequences of that could be "blurred" or "faded" images ofcompact structures in galaxies, primarily at z>1 for their emitted X-rays andgamma-rays, but perhaps even in ultraviolet through optical light at higherredshift. So far there are only inconclusive hints of this from z~4active-galactic nucleii and gamma-ray bursts viewed with Fermi and Hubble SpaceTelescope. If correct though, that would impose a significant, fundamentalresolution limit for galaxies out to z~8 in the era of the James Webb SpaceTelescope and the next generation of ground-based telescopes using adaptiveoptics.

Limits to Seeing High-Redshift Galaxies Due to Planck-Scale-Induced Blurring