There is an ongoing argument in the scientific community with regards to light changing its energy in gravity. Some say it looses energy coming out somehow struggling against the force of gravity. This is untrue. It retains its orginal energy but moves into a faster time metric whereby it is different. There is No Tired Light.
The frequency at which light is emitted determines its energy henceforth. It is an absolute even in a changing metric. Light if emitted in fast time will appear to wave faster in slower time by their differentiation.
Light moving into slower time becomes more energetic there. Its frequency is an absolute. Say light moves into gravitational time that is running 10 times slower. It will retain its original frequency and will vibrate 10 times faster in the slower time metric of gravity. Light falling into gravity becomes blueshifted in slower time. It retains its orginal frequency in the metric.
If light is red shifted it is because it began with lower frequency. If it is blue shifted it is because it is vibrating the same as it orignally was at emission but in slower time. The difference in time rate is the difference in apparent energy.
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