We can look at light from old parts of the universe and understand the chemical composition at that place and time the light came from, and how it was moving re

We can look at light from old parts of the universe and understand the chemical composition at that place and time the light came from, and how it was moving relative to us (i'm guessing most people will know about red shift, not everyone will, it's essentially if something is moving away from us, the wavelength gets stretched or in other words the light gets redder.) We've seen examples, where light (ok space) is bent by a heavy mass and we've seen light from the same source arrive to earth via different paths. This approach with the black whole might allow us to do the same thing, but with light from the same object coming to us via an enormous number of paths, and having left the object at enormous number of different times, allowing us to simultaneously observe light from same object over millions of years If you could collect enough photons and crunch them, you can imagine being able to reconstruct a map of matter moving and changing relative to the black hole over time. No idea if we can really do this, but its an exciting idea