closed as unclear what you're asking by Pieter, Jon Custer, stafusa, Chris♦, Cosmas Zachos Feb 11 '18 at 3:40
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since black holes are invisible bodies in the space (they're so dense that even light can not escape) they can't be mentioned as "hidden". also if the photon sphere you're talking about is close enough, it's most likely to be absorbed by the extreme gravity of the black hole.