Is it possible to travel in the universe as light and shall I get the past life if I travel in antidirection?
492519
There is nothing like antidirection. \nWell, if it becomes possible (assuming) to move at the speed of light, the time dilation formula of the special theory of relativity says that the time would not elapse. That means your aging will stop!\nIf it becomes possible (assuming) to move with speeds higher than that of light, many things could happen. According to the time dilation formula, the time would become an imaginary quantity. One of the interpretation of this imaginary time goes like this: the time will start moving backward. Possibly, that is the situation when you can expect moving back to past. But, further mathematics shows that you are not necessarily going to reach to your own past. Rather, you could land onto some other, strange, alien universe!\nAt this point we have not talked about the change in your mass or length if you are moving with such a high speed. But, for sure you are not going to be the same!
1068787
travel into the future is possible by einstein theory as one approaches the speed of light.  \n\nTraveling into the past is a different story though, access would have to be open from the past for this.  There is no way to create a portal to the past, someone from the past would have to create the portal to the future where the future person could pass.  \n\nIt is argued though that this would only open a door to another dimension and another universe independent of our own universe.  If you think about it, the fact that someone could 'travel' to the past is direct evidence that other parallel universes exist.  If you were to travel back into time history and events would inevitably be changed from occurences known to us in the present, therefore you must be in another universe.  \n\nAnother way to see the past is to create a large gravitational force bending space time such as a blackhole, and align it so that the light traveling from where you are would be bent back to a location where you could observe it.  This would be like viewing T.V. though, because you could have no interaction.
1011227
Love to give you specifics, but don't know how.\n\nTheoretically, what you suggest is possible by relativistic theory. There are things called "tachyons" which are these kinds of rays which reverse time - well not "reversing" it, but definitely messing it all around.  Einstein said that nothing could accelerate to faster than speed of light without becoming infinite mass - but "...Einstein said nothing about entities already traveling at that speed or greater..." (Prote in K-Pax).  \n\nSo who knows - is it around the corner for us?  Probably not.  Is it possible?  I love this universe, so I say yes.  Keep surprising me...
721881
I dont think time travel is possible! Even if you were to go faster than the speed of light, it still takes time to get to where you are going. And that brings up another question, where do you go?? Do you zoom around the planet a few million times? Which direction? Does it matter, it still takes TIME to do it.\n\nJust for argument sake, lets say you could go back (or forward) in time. I dont know why you couldnt be seen, you just traveled to a different time and when you get there your there, just as if you were to travel to a different city.
426560
No, you can't. Even if you could accelerate yourself away from Earth at near the speed of light, you wouldn't experience any slow down of your local time. However, when you returned to Earth you'd find that people there had aged faster than you. They'd be older than you, but you'd still be the same biologic age as when you left.
692266
It is an open question of physics, whether it is possible to travel backwards in time. No one knows yet.\nhttp://en.wikipedia.org/wiki/Time_travel\n\nBut it is known now that it is possible to travel forward in time faster than normal, you just should move around very quickly, close to the speed of light. That is called the Twin Paradox.\nhttp://en.wikipedia.org/wiki/Twin_paradox
41924
It is definitely possible. However, we do not have the technology needed to reach the kind of speeds necessary to allow for travel to other solar systems, stars, etc. Here's something to consider, though. Einsteins Laws of Relativity, while not allowing travel at full light speed, do allow travel almost up to (and just short of) light speed. As you go closer to light speed, the traveler's clock would "slow down" as compared to an observer's clock on a "stationary" object. If you got close enough to light speed, you could travel across the galaxy (100,000 light years wide) in what might seem minutes or hours to you, and about 100,000 years to me. Great, great stuff. To learn more about this concept, google "twins paradox". Or go to http://media.nasaexplores.com/lessons/02-060/9-12_2.pdf and scroll down to page three. This will explain it more fully to you.
8700
no. well, its absolutely impossible to travel at the speed of light, but lets pretend you can so i can actually give you an answer to the question. The speed of light is actually the ultimate speed limit to the universe, nothing can travel faster than light, so although you would expect the light to be going at twice the speed of light (you plus the speed of light)it can't because it is physically impossible for even light to travel faster than the speed of light so it would be going at the same speed of you and not reach any path in front of you.  Of course, if you turned on your headlights before you started moving, the light would always be one step ahead of you.\n\nbut again, this situation couldn't happen anyway since you can't get to the speed of light, and if you want to know why, look at some of my answers to other questions about time travel (which involves velocity distorting time) and shining flashlights and such.
1002813
The key point to this whole question is if you could travel faster than light.  Since at our present knowledge of physics says no, and our current tech is not able to get anywhere remotely near the speed of light let alone faster than it, we will assume this hypothetical question implies these two things don't matter.\n\nIf so, then yes you could see into the past if you had an adequate viewing device which could discern the light you would receive at the end of your journey--light which you left behind by going faster than it.  But to see exaclty the number of years in the past as the light year distance you travelled, you woould have to move instantaneously.  If you had any non-relativistic travel time, you would have to consider time of your journey to determine how far in past you were seeing.  If you travelled 1.1 times the speed of light, you would only get to see .1*light year distance in years past.
1139606
Im afraid I do not think time travel is possible.  Einstein’s theory says that as you move faster time slows down.  The problem lies in getting to a speed that is so fast that time actually moves backwards.  Anything with mass cannot reach the speed of light, because as its speed increases the amount for energy required to push it increases, so it would take an infinite amount of energy for something with mass to reach the speed of light.  Photons have a zero-mass and therefore light can travel at... well the speed of light :)\n\nSo if it was possible to break ourselves down into zero-mass pieces then it would be possible to travel the speed of light.  What is unknown is if you could travel so fast that you could actually "turn back time" which I do not believe is possible.  Or else we would see people from the future already coming back to the past.\n\nAnd then you would get those crazy little problems of ... if you went back in time and killed yourself at say 12 years old.   How would you have ever been old enough to actually travel back in time to kill yourself... because you would have been dead...\n\nIt could be possible to slow time down in relationship to yourself, so that the earth ages faster... If you consider that time travel.  Say for example you get into your space ship, and travel near the speed of light, then the earth would age faster relative to you.  If you consider that time travel then yes I believe that is possible.  But the thought of going forward, and back in time is not possible in my humble opinion.
222343
you can travel to the future but not the past, the closer you travel to the speed of light the faster the time goes by on the outside. I once knew how this worked but can't rememeber now.\n\nIn order to travel through time, one must travel at the speed of light, or at least at speeds very close to the speed of light. The problem is, as you mention, that it is not possible to accelerate something up to the speed of light. This comes from the theory of special relativity. In that theory, Einstein has shown that as something accelerates and travels at great speeds its mass increases. And the larger the mass of the object, the harder it is to give it a push to make it accelerate some more. So when the speed of the object gets really close to the speed of light, its mass becomes almost infinite making it impossible to actually give it the speed of light (or speeds faster than the speed of light). \n\nBut you don't need to travel exactly at the speed of light to "travel to the future". This also comes from Einstein's special relativity. When things travel at speeds close to the speed of light, time slows down. For example, if you were travelling for 10 years in a spaceship that could go at 95% the speed of light then 32 years would go by for the people that stayed on Earth. So in that sense you could say that you have traveled in the future. However we do not have the means to accelerate our space shuttles to speeds even close to that. The space shuttle travels at about 17,500 miles per hour which is 40,000 times slower than the speed of light. At that speed, an astronaut would have to travel a billion years in his space ship in order to jump one year in the future!
909079
Yes, it's possible but you would never be able to return from the future and you would have to travel close to the speed of light somehow.  According to Einstein's theories of relativity, if you travel close to the speed of light, time will slow down, so that hundreds of years could pass here on Earth while you travel at a fast speed.  So you would return to Earth in the year 3000 for instance at the same age as you are now, but you would never be able to travel back in time.  Time travel backwards is supposed to be impossible.
27421
It is not known whether this is possible or not right now. So it is possible that it's possible. :-)\n\nFor example, several credible scientific theories postulate the existence of parallel universes that can be accessed via various ways. Most of them would only allow one-way travel right now (like through a black hole), but the physics are not fully understood, obviously. It is possible that we could find a different one-way path back to this universe from the other one, for example.\n\nSee the article below for some conjecture from one of the great physicists thinking about these things. He wrote the book "The Elegant Universe," which also makes for interesting reading about these types of things, and gives a layman's introduction to string theory.
560353
Not we as humans, but scientists are working on the technology to send atoms back in time.  The logic to behind this makes no sense.  Here's part of an article I read once on the website Space.com:\n\nTaught in physics classes the world over, Albert Einsteins theory of special relativity holds that no object or information can move faster than the speed of light in a vacuum, or 186,000 miles (300,000 kilometers) per second. But NECs Lijun Wang says he created an experiment in which a light beam raced through a gas-filled chamber so quickly, it exceeded the speed of light by a factor of 300. Whats more, the light pulse appears to have left the confines of the chamber before it even entered a seemingly impossible occurrence according to theories of causality, which predict that causes must always precede their effects.\n\nSo, this possibly hints that the light is going back in time, but if this is what it means it violates laws of causality and sends quantum physics into disrepair.  \n\nTraveling to the past is impossible given our current views of the universe and physics.  However, if the universe isn't a universe, but rather a multiverse of infinite parallel universes we could jump to another universe that exists simulatneously at an earlier time.  This would not violate causality or the grandfather paradox (which is that if you could go back in time you could kill your grandfather  which would mean you would never be born to kill your grandfather).  YOu could kill your grandfather in another universe and you would never exist in that universe, but you would still exist because in your universe your grandfather had never died.
15796
Its not proven but heres how eistine put it.\n\nThe faster you travel the more you weigh. Since light is the fastest moving thing in the universe if you went faster then that you would way infinite pounds and that would be impossible so you cannot go faster than the spped of light
1026311
Time?  No.  Space?  Hell no.\n\nUnfortunately, we will never be able to do either of the two.  The energy levels in our solar system are what hold our molecules and atoms together.  Stray too far and you will find yourself entering a part of the Universe that has a different charge balance, the electrons will begin flying off, and you will start falling to pieces.\n\nTime travel is a concept that everyone can understand so it persists.  Any changes that have happened to the matter have already taken place, there's no going back.  Just like you can't unburn a match, you can't turn back time.
436694
Technically no.  As you get closer and closer to the speed of light the weight of objects grows and grows so that eventually it will stop accelerating.\n\nOne thing that is possible is subspace, freespace, or wormhole travel, all of which are the same thing.  This is where space bends so that the distance is made shorter.  An example of this is traveling to the other side of the world.  You can go around the world, or you can go straight through the center (this is impossible), which distance is shorter.  To achieve subspace travel you must open up a big enough portal of quantum foam, or the space between the nucleus of an atom and its electrons.  We can not currently do this because we do not have the ability to make cold fusion which is the only 'safe' way to supply enough power.  Navigation, however, is a completely other story.\n\nhope this helps answer your question.