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The fifth dimension in the five-dimensional space is time. Time is invisible, touchable and undetectable. Extraterrestrials have a five-dimensional space system, and the solar system only has four-dimensional space due to the black hole devouring it. The time in the black hole cannot escape and is trapped in it, as if time has stopped, so the earthlings cannot. Seeing and detecting the so-called five-dimensional space, and being unable to communicate with the five-dimensional world, is like being locked in a box that will never be opened.