I belive what CP was seing is the way the smoke from the fireworks blocks the wave lengths of other colors. Red is able to get through.
Also, what is interesting about red shifts is that they appear to be quantized and this has interesting implications for the study of the universe. This suggests that the red shift may be caused by something other than the expansion of the universe, at least in part. This could be a loss of energy of light rays as they travel, or a decrease in the speed of light through discrete levels. Maybe there is some other explanation.
Several well-studied galaxies, including M51 and NGC 2903, exhibited two distinct redshifts. Velocity breaks, or discontinuities, occurred at the nuclei of these galaxies. Even more fascinating was the observation that the jump in redshift between the spiral arms always tended to be around 72 kilometers per second, no matter which galaxy was considered. Later studies indicated that velocity breaks could also occur at intervals that were 1/2, 1/3, or 1/6 of the original 72 km per second value.
That is what you told her, right GD?
