If there was no such thing as sight could we prove that you can't travel faster than the speed of light?
540890
Well yeah, of course we could. \n\n\nThe light we see with our eyes is only a tiny fractionn of the total light spectrum. Even if we couldn't see we would still have had access to all the same instruments for detecting the invisible spectrum. The only difference would be that we would also have invented instruments for detecting the visible spectrum.\n\nIOW the radio would still have been invented, radar would still have been invented, heat detectors would still have been invented, x-ray photography would still have been invented and so forth regardless of our ability to see. That is because those things are so incredibly useful regardless of eyesight. In fact wihtout eyesight they would have been even more important.\n\nAnd because we would have invented the all those devices toy to detect and measure the light spectrum  we would still have been able to prove that the speed of light is constant.\n\nIn fact you could make a very good argument that without inherent eyesight we would have come to the theory of relativity even sooner, since there would have been a greater need for, and hence more study into, the fields of optics and electronics that gave rise to relativity.
355200
Theoretically, there is such a thing. It is called a tachyon, and has the ability to travel at beyond light speed. However, the physics of such a particle are very hard to figure out, because of the sheer mechanics of such a feat. \n\nAnd, as one of the guys above me said, galaxies that are beyond 13 billion miles away from us are travelling away from us at light speed and greater; this is why we cannot see them. The only way we know they're out there is because we think the universe is infinite, and that it is much the same throughout as it is here.
1085739
OK!! Ignore the people who are saying that nothing physical can travel at the speed of light.  Light is physical and does actually travel at the speed of light!!  \n\nOnto your hypothetical train.  If the train is travelling at the speed of light and you try to run from one end to the other, logic dictates that you'd be travelling faster than light, but this time logic fails us.\n\nIt is impossible, according to einstein to travel faster than light.  But, according to einstein, it is possible to run from one end of the train to the other!!  This is done because they would be in the same place!  This is due to a part of the Theory of relativity call Lorentz contraction! \n\nAccording to you, the train would be the same length as it would be if stationary, and you would feel like you were running as if it were stationary.  But relative to the observer that is 'stationary' (actualy no such thing according to einstein) you would be at both ends of the train at the same time because you and the train would be zero.  The formula for lorentz contraction is L=L(0) x (square root of(1-(v/c)^2)).  Where L is the length of the train according to an observer, L(0) is the length of the stationary train, v is the speed of the train, c is the speed of light.\n\nIf you make v=c then you'll see that the train and you have absolutely no length.
657426
Well the sad truth is YOU CAN'T...in fact you can't even travel at one times the speed of light. Einstein covered this about 100 years ago. Anything that has mass cannot achieve the speed of light for a couple of different reasons. Trust me on this.
32161
For a human to travel at the speed of light is impossible, at this time. The human body would not be able to withstand the effects of traveling at that speed. Also, an energy source and means of propulsion is currently unavailable. Who knows what will be attainable in the future.
28019
no. and light does not have mass. light is made up of little packets of energy called photons which are massless.\nthis is why it can't: lightspeed is the ultimate speed limit of the universe. nothing can go faster then the speed of light because in the formula for time dialation(time slows down for an object moving close to the speed of light) t'=t/sqrt(1-v^2/c^2) where t' is the time passing for an outside observer, t is the time that passes for the object going at the high velocity, v is velocity, speed is the speed of light and ^2 is squared. (note: this formula is definately correct, it's part of einstein's theory of relativity and I've had to derive it myself for class) so if v was bigger than c, you would have a number greater than one and therefore a negative number under a square root, which is impossible.
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.
671137
Actually....according to Einstein...if you could survive traveling at that speed the answer would be yes. Einsteins theory states the light from your headlights would be traveling at the speed of light! Let me make this simple...if the auto you were driving was travelling at the speed of light the light from the headlights at any given point in your travel would still be traveling forward again at the speed of light. His theory also states that at the speed of light the only variable that changes is time. Personally, I dont believe in the theory, in particle physics it has been proven that paired particles "know" when their particle twin has had a change of state regardless of how far away from each other they are...this being said...some form of communication between the two must travel faster than the speed of light!
559732
No, it's not true.  You can only occcupy one person-sized point in space at any given time, no matter how fast it's moving.\n\n\nAs a though experiment, though, if you were to run very much faster than light, it might be possible for you to arrive back at the starting line in time to see the IMAGE of yourself departing.  \n\n\n"There was a young man, named Bright\nWho travelled much faster than light.\nHe went out, one day, in a relative way,\nand came back the previous night."\n\nThe rumbling sound that you can hear is Einstein revolving in his grave, at near-gyroscopic speeds...
672393
Right now, many scientists believe that we cannot go faster than the speed of light.  As you get closer, the plane would get heavier and heavier until it slowed down.  Right near the speed of light, the plane would weigh almost infinity so it wouldn't be able to go faster.\n\nIt might be possible to somehow bypass it, but that's mostly science fiction right now.
51835
The physics community thinks not, but that never proved anything. The assumption is that nothing can travel faster than light. The answers are usually along the lines of, "since quantum entanglement happens instantaneously, its faster than light, but nothing can travel faster than light, so its impossible".\n\nThere may come a future theoretical structure in which lightspeed is surpassed under some circumstances, without temporal repercussions, then this assumption does not hold.\n\nI would add that I think its possible, based on an experiment described in Brian Greenes fabric of the universe that he uses to explain that its not.\n\nIts a simple extension of the two slit experiment where, immediately after the slits you use a photon doubler to create two entangled photons for each one passing through the slits. One for each slit. One photon carries on, the other is bent off at 90 degrees using a half silvered mirror and sent a long distance.\n\nIf no measurement is made on this second photon,, the other photons act as waves and you get an interference pattern. If a measurement is made, they act as particles and you get hotspots behind each slit.\n\nMy extension is that, by choosing to measure the photons that travel a long distance, you can instantaneous make the photons produce an interference pattern or not. Such a pattern would be noticable. If the split photons have travelled many light years, this pattern should be formable in a few seconds, so the message is coded in interference / non interference. Much like morse code in dots and dashes.
1042298
No it can't.\n\nLaser light goes at exactly the speed of light.
935501
Well theoretically you wouldnt be able to travel at the speed of light. At the speed of light yoru mass would become infinite and time would virtually stop for you. But at the speed of light the light would still be infront of you. Think of it this way if you are in a race and the runner directly infront of you is traveling at the same velocity as you you would neither fall behind nor would you catch up. So the light would be in front of you.
364291
No, because according to Einstein's equations, to accelerate anything towards the speed of light would require more energy than exists in the universe (after converting all matter to energy).\n\nThere is a theoretical particle that never goes slower than the speed of light, but it has not been experimentally proven. They're called tachyons. http://en.wikipedia.org/wiki/Faster-than-light
53622
Well, its absolutely impossible to travel at or faster then 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 slower than 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 be one step ahead of you.\n\nOf course, still, nothing can go faster then the speed of light because in the formula for time dialation(time slows down for an object moving close to the speed of light) t'=t/sqrt(1-v^2/c^2) where t' is the time passing for an outside observer, t is the time that passes for the object going at the high velocity, v is velocity, speed is the speed of light and ^2 is squared. (note: this formula is definately correct, it's part of einstein's theory of relativity and I've had to derive it myself for class in the past) so if v was bigger than c, you would have a number greater than one and therefore a negative number under a square root, which is impossible.
1186042
That's the problem. You can't go beyond the speed of light. It is the cosmic speed limit. But if you could, then you'll be able to travel through time, past and future.
109643
No you can not.\nNothing can travel faster than light. Not even light itself.\n\nIf you think that light is a wave (like a wave on the ocean) Imagine that you were riding one wave and were trying to make a new wave from your position (with equal frequenzy ofcours). The new wave would not have twize the speed as the one you were riding, it would have the same speed as the one you ride (try in the bathroom and you will see).\n\nMy point with this explanation is that the light from the back of your car will never reatch the mirror. I think your mirror would seem black, because no light would reatch it. The lightwave from the back of your car would be "flying" towards the mirror in the same speed that the mirror would fly from it. :)