>>13705745If anyone is interested, I did some digging and this is indeed a thing considered by the scientific community:
In 2005 MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescopes detected that among gamma-ray photons arriving from the blazar Markarian 501, some photons at different energy levels arrived at different times, suggesting that some of the photons had moved more slowly and thus contradicting the theory of general relativity's notion of the speed of light being constant, a discrepancy which could be explained by the irregularity of quantum foam.[6] More recent experiments were, however, unable to confirm the supposed variation on the speed of light due to graininess of space.[7][8]
Other experiments involving the polarization of light from distant gamma ray bursts have also produced contradictory results.[9] More Earth-based experiments are ongoing[10] or proposed.[11]
