Let us consider a situation wherein the mass of a blackhole increases (may be due to it gobbling up a nearby large object), when radiation was in progress from a source (emitter) to an observer, both being originally outside the blackhole boundary. Let us assume that the emitter is closer to the gravitational center than the observer. As the mass of the blackhole increases, suddenly both the emitter and the observer/detector fall within the blackhole boundary. What happens to the original radiation that was in progress outward from the source to the observer/detector. How will it affect the redshift of the radiation in progress? Is energy conserved here? Any insight into it is greatly appreciated.
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