if I travel in to space for one year at speed of one million km by second and came back after one year?
412986
according to einstein's theory of relativity, if you are able to travel at a speed faster than that of light then you will be able to travel back into time. got my point? if you leave earth today at 1 million km/hr, then you will be back on earth before you started out(means you will have travelled back in time) it cannot be said in which year you will return because there is no relation for this case. but good luck with your time travel!!!
585240
um depends how fast you're going. If you're going the speed of light it would only take 8 minutes. \nIf you were flying in the spaceshuttle, which goes Mach 25 or about 17,500MPH it would still take 221 days to get to the sun. So not even a year.
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.
346914
Yes, especially forward at a rate of 1 sec = 1 sec.\n\nI also believe that other rates are possible depending on velocity and proximity to sources of gravity.\n\nI also would like to believe that it can be reversed, but that's harder to swallow due to paradox effects.
545597
I would go to outer space. Orbit earth a couple times and then land on the moon for a little moon walking.
169854
Of course.  We all travel forward in time, at a rate of 1 second per second.  ;)\n\nBTW, in the time dilation examples cited here, you don't actually travel back in time, it's just that one object travels forward in time at a slower rate as observed from the other reference frame.
70282
No.  You'd need to have a wormhole.  Current theory predicts that transversable wormholes exist but would not allow time travel.  See reference for details.
815830
Time would stop and or reverse for you and your spacecraft, but time on the earth would continue to move forward.  Actually when you stopped you would be far into the future because years would be passing on the earth in seconds of time on your spacecraft.  Common theory is that you can not travel faster than the speed of light.  The reason for this is that the closer to the speed of light that you travel your volume gets exponentially smaller and your mass gets exponentially larger.  So that at the speed of light you would need an infinite amount of fuel to propel an infinite mass that has a volume of zero.  Essentially you would be disintegrated at the speed of light.
1000407
Einstein was referring to Time Dilation.  Time dilation would make it possible for a fast moving clock to travel into the future, while aging very little. That is, the clock (and according to relativity, any human travelling with it) shows less elapsed time than stationary clocks. For sufficiently high speed the effect could be dramatic. For example one year of travel might correspond to ten years at home. Indeed, a constant 1g acceleration would permit humans to circumnavigate the known universe (with a radius of some 15 billion light years) in one human lifetime. The space-travellers could return to earth billions of years in the future (provided the Universe hadn't collapsed and our solar system was still around, of course). A scenario based on this idea was presented in the novel Planet of the Apes by Pierre Boulle.\n\nA more likely use of this effect would be to enable humans to travel to nearby stars without spending their entire lives aboard the ship. However, any such use of this effect would require an entirely new method of propulsion. A further problem with relativistic travel is that the interstellar medium would turn into a stream of cosmic rays that would destroy the ship unless stark radiation protection measures were taken.\n\nCurrent space flight technology has fundamental theoretical limits based on the practical problem that an increasing amount of energy is required for propulsion as a craft approaches the speed of light. The likelihood of collision with small space debris and other particulate material is another practical limitation. As a result, time dilation is not currently a major factor in space travel.\n\nIf you would like further explanation of this theory, just let me know.
46704
9.4605284 × 10^12 Kilometers\nOR 9,460,528,400,000 \n1 light-year is equivalent to the distance travelled by light in 1 year moving in a vacuum.
56541
You would be in a different universe than you are now, because the laws of our universe say that a massive object can't go faster than the speed of light (or even as fast).\n\nAlso, if you changed the question to "...1 mile per hour less than the speed of light", you would have to specify "relative to ..." (what?)  And then you would have to say, what would happen as observed by (whom?).  In this question, relative to you, the headlights would turn on and you would be able to see things 186,000 miles ahead of you (as you measure miles) within 1 second (as you measured seconds) .  Relative to the observer that thought you were moving 1 mile per hour less than the speed of light - assuming you were moving toward the observer - you would get to him or her just a tiny fraction of a second after he/she saw the headlights turned on.  Your measurement of the speed of light would be consistent, but your measurments of time and distance would be very different.
1040094
I remember it being said that if you were to travel at light speed for an hour, the amount of time that would pass on Earth would equate to years.  Indeed, it went further on to say that a baby would have grown into an old person in the amount of time that elapsed.  Taking that into account (let's say 60 years), assuming that the passage of time would be linear, and that there are 8,760 hours in one year, then perhaps some 525,600 years would've passed on Earth.  \n\nHowever, I'm thinking I did something wrong here.
181040
yes but to get to other universes u must travel out of our universe and then travel to another one but that would take 1,000 years to complete at the speed of light but if you dont belive me look it up on google...or watch the science channel
1085806
I remember Carl Sagan talking about this on one of his appearances on the Johnny Carson Show.  \nBecause the speed of light is always a constant to any observer, the information would still be reaching you at the speed of light.  Now, based on spatial compression and time dilation on your part possibly you would receive more than one of earth's second's worth of information in the time it takes one of your ship's seconds to elapse. But, bear in mind depending upon how close you got, you would need to slow down so as not to impact ar go by and be going away from earth, so you would eventually come back into synch with earth's space-time frame of reference.
85459
it would be like being able to run real fast and turn the earth around backwards and turn back time. to about 6 months ago and still know what i know now and prevent certain things from happening...
971235
Depends on your momentum when you do so.\n\nIf you're utterly still and blow out air in space, you will move backwards.\n\nWell, your frozen corpse will...
604528
Gravity won't let you. You have to go into orbit first, and 1 mph will not do that. You have reach escape velocity to escape earth's gravity, which is 11.2 km/s.