The expansion of our universe stretches out light causing the phenomenon known as "redshift." When light falls into a black hole... Its wavelength gets stretched out infinitely? Light with a flat wavelength? Or is there some limit to how much a wave of light can be stretched out... There's a limit to how fast light can move... so why not a limit on redshift... and would a black hole's gravity be enough to reach it? If so, what would this light look like? Could we even detect it? Could black holes be shining with light that we don't understand?