New answers tagged light
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tldr; extremely little. Space is big, even biggest black holes are ridiculously tiny in physical size
The amount of starlight absorbed by black holes is really minuscule. A black hole is not going to be sucking light in: it can be fairly well approximated to be an absolutely black object around the size of its event horizon (or photon sphere, does not ...
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The (late time) ISW is caused by the evolution of cosmic structures as photons of the cosmic microwave background traverse them on their way to our detectors. It may cause a redshift or blueshift with respect to the redshift predicted for a homogeneous expanding universe.
A bit more detail: If a photon "falls" into a potential well, its frequency and energy ...
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Partial answer for now.
tl;dr: It will be an "exercise in futility".
This is a great question! With tens of thousands of very similar satellites in LEO the number of occultations that will occur from a given observatory will be much larger and better characterizable than with the current diverse population, so "if it were useful it would have been tried ...
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