Question: From our frame of reference on Earth, objects slow to a stop as they approach black holes in space because time gets infinitely stretched by

From our frame of reference on Earth, objects slow to a stop as they approach black holes in space because time gets infinitely stretched by the strong gravity near the black hole. If astronauts accidentally falling into a black hole tried to signal back to Earth by flashing a light, what kind of "telescope" would we need to detect the signals?

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