About bootstrap paradox

Today we are going to discuss about bootstrap paradox. This paradox shows that the flow of the time is linear and we can't change the things happen in the past. If we can then we will trap at an endless loop form that paradox we can coclude that we can only travel in future not in  past with the help of time machine. 
lets understand this with the help of example that will clear  your concept. For eg-Tom is a scientist and with his hardwork he make a time machine. He is big fan of Stephen Hawking. And he also want to do some argument on black hole with Stephen Hawking. so he want to go in in past  with the help of his time machine.With the reference he takes Stephen Hawking book about black hole. Then with the help of  time he goes in  1965  when Stephen Hawking was studying about something else. When he met Stephen Hawking and tell him about black hole. Stephen Hawking refused to believe in black hole existence. Then  tom became angry  and  come to present. But he forgot to take the book of black hole by Stephen Hawking. And then he refused to go in past to take the book. After sometime Stephen Hawking found that book and after reading the book he  believe in existence of black hole. Then he published that book with his name. In this situation who is the real  founder of black hole theory Stephen Hawking or tom. Because Stephen Hawking got the book with the help of tom and tom got the book in future that is published by Stephen Hawking. So in this paradox the book will trap in an endless loop that's the paradox. This oppose the exploration of our travelling in past. But some people believe the things that we will change in our past is change in Parraell universe. 







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