But do you know some of the scientists like Stephen Hawking say that it is possible to reach future but not to the past. He argues that if going to past had been possible, someone from future would have visited us at present. But many scientists do not match with him. They say that that may be only oddity not difficulty. Is time travel really possible?
Travelling through time specially refers to going back to past not to the future and going back to the past violates the laws of the physics. There are paradoxes which say it is impossible. Most popular one is grandfather paradox. It says that if time travel is possible and you went back to the time but you killed your grandfather before your father was born, it means you will not be born in the future, Then who went to the past to kill your grandfather? So travelling back through time is against the laws of causality in Physics.
Wait, the article is not over now. Paradoxes are only oddities not impossibilities. Many theories have been developed which solve the problem of paradox. One of them is Many Worlds Theory. This theory has solved all questions of grandfather paradox. This theory advocates the existence of the parallel universes. So if you go back to the future or past that is not the universe you were living. That is another universe parallel to this universe. It means you can kill your grandfather there but that does not affect your present or future.
All of you know that Einstein’s Special Theory of Relativity supports the existence of wormholes. Wormhole is all around us. Wormholes are believed to be the shortcut to the time. It means if you enter through the wormhole, you will reach to the past. But wormholes are so small that we can’t even see it with our naked eyes. How can we enter there? However some scientists believe that it is possible to catch one of the wormholes and enlarge it to enter human body inside. For that we should have very advanced technology.
Humans do not know wormholes are really existed or not. But they have some proofs to prove the existence of the black holes. Black hole can be the means to reach future. Because due to strong gravity, time passes so quickly near the black hole. That means if time travellers rounds the black hole, they will reach in future world. But it is really so risky. No one knows if someone falls into the black hole, what happens to him. His body may be converted into a tiny atom. May be he will again arrive in our universe. And also may be our universe with the present time is a white hole.
Travelling to the future means travelling with the speed of light. Laws of Physics forbid anyone from travelling with the speed of light. Einstein says that it is not possible to travel faster than light. If someone travels faster than light, the time stops for him. It means he will die. All scientists do not agree with Einstein. However no one has proved him wrong. But here is a good news. You should not travel faster than light to reach future. You should travel near the speed of light. But for that, we need too much energy and very advanced rocket which can round the earth about 7 times in a second. Till now, the hadrons collider in the Switzerland is the fastest motion on the earth that can be the future time machine. Also if the collider originates special type of new particle like higgs boson, that can have multiple dimensions and one of them can be the way to past or future. One of the members of CERN has said.
Scientists say TIME as fourth dimension after length, width and height. Travelling through time means going to the past or future. If you can make a time machine that can walk on time, it will take you in the desired time that is past or future. Currently we are travelling in one direction with the speed of 60 seconds per minute. Time is like a river which is flowing in one direction. Is not it possible to swim back if we manage energy and way to swim backward? So majority of physicists believe that one day humans will make time machine.
Besides the ideas above the concept of Cosmic String and Bipolar Cylinder are also famous in Physics as the reliable theories to travel past or future.
Physical presence in the past or future may be impossible. Is it hypothetical? But one can travel past or future through technology and mind. Yes, mind can travel in the fourth dimension which is Time. Mind can travel faster than light though it is immaterial. But matter may not travel on time. So only one way to reach past or future is by developing the technology with mind. Just you think, you can go to past or future by closing your eyes. But that is also imaginary. We should be able to bring such technology that keeps our body in a machine on the earth and our mind in the past or future universe.
Happy Travelling!
