A scientific team, led by R. Ragazzoni (of Arcetri, Italy, and the Max Planck Institute for Astronomy, Heidelberg, Germany) calculated that infinitesimally small quantum scale variations in spacetime would blur images of galaxies seen over vast intergalactic distances.
Instead,with the use of the Hubble telescope, diffraction patterns for a supernova and a raw image of a second galaxy more than 5 billion light years from Earth, revealed images much sharper than should be possible in quantum scale phenomena generated, as previously supposed.(This research was published in Astrophysical Research - Letters, April 10, 2003)
The implication of Dr. Ragazzoni's experiment, as he concluded, is that the universe is causal. To me, this is one more piece of a jigsaw puzzle that confirms Einstein's view of a fully ordered universe, in contrast with the implication of the quantum theory.