Those who want to keep the possibility of time travel must give up hope of going to the past, and we call it "past travel". Among the many paradoxes that have plagued past travel theory, the dual occupational paradox is the most severe not only because of its potential physical violation but also because of the seriousness of the people who oppose public opinion It is known to be. In opinion of the public, the time machine collides with the past and thinks that it can not move in the past. This is because there are not two things that can exist simultaneously in the same place.
Throughout history, physicists have discussed the rationality of time travel. The theory of relativity allows time for a journey to the future, fast return to the Earth is only slightly older than its colleagues. Einstein's theory is a spatiotemporal theory and there is no doubt that it provides a way for black holes to conceptually traverse space-time. It is conceptually possible, so it does not mean that it is implemented. A black hole is the product of the collapse of a huge star due to extreme gravity, which prevents light particles from leaving those surfaces, making it almost invisible. The black hole is a one-way street and you can drop an object into a black hole, but you can not get out of that gravity. In the 1960s New Zealand mathematician Roy Cole says that singular points form a ring when the black hole is rotating.
Einstein predicted that, in the theory of relativity, the wormhole is a region where space and time bend and distort the distance. According to Einstein's theory, the two black holes can be connected through a wormhole called Einstein - Rosen Bridge. However, it can not pass through the wormhole. Because the wormhole needs a lot of negative energy to cancel the huge gravity of the black hole, it can not penetrate because it is too unstable to keep it open.