The authors compute retrolensing light curves for Earth as the light source and find the returned image would be about magnitude 32 for a hypothetical very close black hole and magnitude 61 for Sgr A*, so the effect is not practically observable.
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Black holes as gravitational mirrors
The authors compute retrolensing light curves for Earth as the light source and find the returned image would be about magnitude 32 for a hypothetical very close black hole and magnitude 61 for Sgr A*, so the effect is not practically observable.