Does Time slow down the faster you go or does it speed up?
598949
Depends on your perspective.  As you travel closer and closer to the speed of light, time for you will seem to be normal, but you will see it speed up for others who are stationary.\n\nIf you are the one who is stationary, time will seem normal to you, but it will slow down for the one traveling.\n\nAn example - your twin has just been chosen to go on an interstellar trip.  Thankfully you're telepathic and can communicate over any distance.  As she speeds up, you will notice that there are longer and longer times between her transmissions to you, even though she says she'd contacting you at the same time every day.  And when she returns to earth 50 years later, you find she's only aged 10 years! (Robert Heinlein wrote a great novel about just this scenario - "Time for the Stars").\n\nScientists have proven this amazing fact in many experiments. They've put an atomic clock on a fast jet and flown it around the world.  When they returned, the clocks had different times than those on the ground.  But not by much - the clocks were between 50 and 270 nanoseconds different than their stationary counterparts - that's 50 billionths of a second.  Not much - but 500 mph is pretty slow compared to the speed of light.\n\nAnother way this is used in everyday life is the GPS satellites.  This navigation system has to take relativistic effects into account in it's transmission signals in order to get the high accuracy it's capable of. Every GPS satellite has an atomic clock aboard.  Because of the speed of the satellites, a ground observer will see them ticking slower than real time, so the signals have to be adjusted.\n\nTo answer your question - if you traveled around the world at 700 mph for a week, you'd be a few thousandths of a second younger than your friends who stayed behind.
459592
Let's suppose you had a theory which explained that something would take t seconds.  Another theory says that it would take t + x seconds.  You want both theories to be true.  What do you do?  Well, if you are a genius like Einstein you say that time stretched from t to t + x seconds when you went from one theory to the other.\n\nTake another example.  Suppose you are running a race with a stop watch.  At the end of the race your stop watch says you took 60 seconds.  My stop watch says you took 90 seconds.  The logical explanation is that one or both of our clocks are wrong.  But, if you are an Einstein, you say that time was stretched, and your clock moved slow relative to my clock, but is still accurate.
397782
If the clock is constantly moving at constant velocity, then you're right, the people on earth will say the plane's clock is going slower, whereas the people on the plane will say the earth's clocks are slow.\n\nHowever, when the plane starts and stops in these experiments, it undergoes an acceleration, which differentiates the two frames. That's why the plane's clock is behind when it's compared to the earth clock. Basically it's because the plane changes which inertial frames it is a part of when it accelerates. Your point is similar to the twin paradox, I suggest you check out my source, that should clear things up, you sound like you have a solid enough background to understand it.
1035592
You're question is worded strangely.\n\nModern physics suggest that time does not, as we commonly percieve it to, progress steadily forward from one moment to another. The reason is that there is no plausable mechanism to show how one "moment" is suddenly lit up and set aside as being "now". Furthermore, special relativity shows us that two different observers who are moving relative to one another would disagree about what events constitute a "now". \n\nSo the idea of stopping something that isn't moving in the first place is rather presumptuous.\n\nHowever, throwing caution to the wind, there is every reson to believe that time stops for a weightless particle moving at the speed of light, and that time stops within the event horizon of a black hole. For whatever those observations are worth... there they are.\n\nHope that helps.\n\nEdit - S_k_Latif, please either more thoroughly research and understand the topics you reply to, or do not reply to them at all. There is no good reason to spread faulty or innacurate information. What you just said makes exactly zero sense. Just being honset.
386874
Definitely!\nIn fact, it's a proposed method for 'time travel' into the future; hover close enough to the event horizon of a black hole, and relativistic time dilation will mean that time will move slower for you than for those further from the black hole.\n\nThe earth's gravity has a negligible effect on time, but it is STILL THERE.
359703
I have always been interested in this.  I view time like a long chain being wrapped around a pole.  The more it wraps around the faster it gets.
559273
Speed of light, dude. The other reaction is the speed of electricity, which is slower than the speed of light a lot! \n\nDo the math - your foot hits the object - less than a second later the impulse hits your brain and you stop stepping down. So to travel say 12 feet (you are six feet + tall, so six feet up and six feet down) it is one second. 1 second divided by 12 = .08 feet per second.\n\nNow take the speed of light, which is roughly 186,000 MILES a second, or 186,000 times 5280 (feet in a mile) which is 982,000,000 feet a second (982 MILLION feet a second). So, to travel the 12 feet would take 0.0000000001018329939 seconds - over 10,000,000 times faster (ten million times faster). \n\nHope that helps!
680669
we r travelling at 1 second forward per second.\n\nIf that's not that u meant, the easiest and most likely way to get a time machine to time travel is for yourself in the future to travel back now to give yourself the time machine now which u got in the "past" from the "future yourself" coming back to gave it to u.
794003
Any speed really will do. Even on modern day jet airliners the Time Dilation effect is measurable with very precise atomic clocks. Of course, its a very small amount, and you must travel at a significant fraction of the speed of light to experience a significant difference from a human perspective (e.g. at half the speed of light, the time dilation faction is about 1.15 (so time travels about 15% faster for everyone else than for you)). Though, to you, everything will 'feel' normal, as every atom in your body is experiencing the same effect. It's kinda weird (and by weird I mean awesome), but that's how it is.\n\nJust for reference here's the equation:\nt= t0/SQRT(1-(v/c)^2)\n\nWhere,\nt = the time observed in the stationary frame (say Earth)\nt0= 'proper time' the time in the moving frame (i.e. a spaceship, etc.)\nv=velocity at which the moving frame is moving\nc = speed of light
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!
1165464
Well, actually, your theory is very similar to that of the Theory of Relativity, or something. If you slowed down time by moving faster, the objects would literally gain weight. (Fat people, plz do not go on space missions...) And once you were travelling at the speed of light, you would have infinite weight. (But of course, your MASS would still be the same. So fat people should let out a big breath.) I'm not sure exactly which theory this is...
308200
Neither Observer EXPERIENCES a change. The ONLY way any comparison can be made between the two unmentioned but essential clocks is to bring them together in the same rest frame again: then whichever clock ticktocked the least would be shown to be the one which accelerated and slowed down in their relative travel.
419064
Well the answer comes with the Einsteins theory of relativity. Time is relative IE. it changes with respect to everybody. to explain in better way you have to first understand that speed of light is absolute. Suppose u are driving a car with a Friend in the same direction parallel to your Friend. if your speed is 10kmph and your Friend's is 20kmph then your Friends seed will be only 10 kmph with respect to you. However it does not happens with light. Suppose you are driving car with 150000000 m/s in the direction parallel to light and seed of light is 300000000 m/s then also speed of light remains the same with respect to you. In this case you will feel that time has slowed down. in this case for you 1 second will become 2 seconds. and if u travel with speed of light for you 1 second will become infinite second and time will stop for you
161290
Time does not move.  It appears to move.\nOur perception of time is based upon the logic centers of the mind.  With training, the mind can be suspended and at that point, time no longer has meaning.\nWhat humans associate with memories, we perceive as the past.  What our logical mind plans for is perceived as the future.  We live in the moment Now.  Our awareness is far less than perfect, so we tend to think in terms of time.\nOne of my favorite movie quotes is by Joel Grey’s character Master Chen in Remo Williams:\n“Time is a confidence game invented by the Swiss.”
592909
It is a real effect and can be important in particle accelerators where subatomic particles are going close to the speed of light. It turns out that the radioactive particles decay slower when they are moving at these high speeds. So it doesn't just appear that time slows down, it really does.\n\nThis is a consequence of special relativity where there are two basic assumptions:\n1) All motion is relative...you can't tell whether you are moving or everyone else is.\n2) The speed of light is the same to everyone.\n\nThe first assumption was true for classical mechanics, but the second was not and is what makes all the strange results of relativity. In some sense, it turns out that someone moving with respect to you has time and space 'rotated' with respect to each other. This makes both space and time measurements different for you and them. Two events that you see as being at the same time or place won't be for them. Two events they see as being at the same time or place won't be for you. The slowing of time is an effect that only applies to events that either you or they see as being in the same place (or very close by). Otherwise more complicated computations have to be done to determine how each sees things. Look up Lorentz transformations.
191735
You are traveling in time as you read this, You may adjust how fast you are traveling by slowing or increasing your velocity. Alternatively you may do so by subjecting yourself to a strong gravitational field. You may not travel in another direction. No matter how you adjust your travel through time relative to an outside observer from your own viewpoint time will seem to pass at the same pace.\n\nPlease consider becoming a member of my group at http://groups.yahoo.com/group/EarthII/
575355
Time refers only here on Earth. Where there is 24 hours in a day. In space, time does not exist. If you travel millions of light years away and then come back, you'll find out that people you know are way older than the last time you saw them.