Is travelling in past and future possible?
Travelling in time, from one point of time to another is the most fascinating topic of science fiction from last one century. A vehicle called machine in which we can sit and ready for adventures in the past and able to see dinosaurs or travelling in future and to see over great-great grandchildren and lives on other exoplanets. It was H.G. Wells who gave a novel based on science fiction the ‘Time Machine’ in which Wells opened the idea of time travel in a machine and then there were movies and serials or comics on time travelling. And there were different paradoxes related to time travel and theories of warm hole in a fabric of time in which one can move from one place of time to another. And these theories also forced theoretical physicist Stephen Hawking to think on travelling backward and forward in time and then he reached on conclusion that time travel is not at all possible. Generally, the perspective of Albert Einstein that advanced the theory of relativity of time and space