Based on these results, the researchers, like in Charman "et al." (1971), concluded that while the Cherenkov effect may be the plausible explanation for the LF experienced by astronauts, in this case, that effect cannot explain the LF seen by the observers. It is possible that the LF observed were the result of interaction of the retina with radiation. They also suggested that the tracks seen may point to tracks that are within the retina itself, with the earlier portions of the streak or track fading as it moves.