will matter remain as matter if it travels in the velocity of light ?
957183
supposedly mass of matter increases with speed, so yes it will remain matter
350726
If you could travel at the speed of light in your space ship (which you can't) and turned on the headlights the light would travel away from your ship at the speed of light. The speed of light is invariant -- not affected by the speed of its source.
108368
Momentum of the speed of light=zero\nMomentum is defined as mass times speed.\n\nthe light don't have a momentum beacuse don't have a mass.  light is just energy.
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!
830869
A Photon being a particle of light would never be at rest.  It is energy in motion.
667965
No, at the speed of light, the space the arrow would occupy is everything, therefore I'd only be hit by an infinite fraction of the arrow, ergo nothing would be felt, noticed nor seen. Furthermore, the arrow would take an infinite amount of time to get anywhere, although it would, from the arrows point of view, still move at the speed of light.\n\n[edit]: After having read all the other posts, I realize that I need to bring some proof of my statement since everyone are making a clueless guess. Thusly, I present to you a link to wikipedia, which fortunately validates my school/university teachings. If you search for the Lorentz Transformation (the factor of which an object stretches in relation to its velocity), you will find that at low speed this factor is very close to 1 (meaning no noticable change in stretch). Though, at a speed infinitely close to the speed of light, the factor also reaches infinity, meaning the object will have an infinite size (but not infinite mass), which means that the atoms of the arrow will hit everything at once, causing its finite momentum (movement energy) to be exerted upon every single atom in the entire universe. Not only does this mean that an arrow with the velocity of light cannot hit a single target, but it also means that nothing will notice anything other than the arrow suddenly disappearing. Furthermore, special relativity states that nothing can achieve the speed of light within a finite time-frame, making you question very theorical.\n\nI would also like to point out the sheer lunacy of the average 'answerer' here on Answers. If you take my answer as being truthful, which you should given the high support within modern physics (which I am also a student of), you would notice that only a small fraction of the members of Answers aren't guessing cluelessly. This is quite sad, and I advice you to regard every answer with suspicion, and use google/wikipedia for valification.
34913
It is not possible for any particle that has mass to travel faster than the speed of light. The reason has a lot to do with relativity. Because the faster you go, the slower time passes for you. So if you are at 80% of the speed of light, and launch a projectile in front of you at light speed, because of your slow passage through time, it will still appear to you to travel at light. Everything is relative, and because of that, certain constants like the speed of light never change.\n\nAlso, a particle with mass would achieve infinite weight at light speed. Since you can't obviously exceed infinite weight, you can't exceed light.\n\nThe ideas behind things like "warp speed" don't propose actually traveling faster than light. What they propose is taking shortcuts through space, kind of like skipping a stone across the surface of the water. Even "warp speed" is subject to the laws of relativity.
172843
force does NOT come into play here at all. the spped of light in a medium is depndant on the refractive index : C/C'= u'/u where u' is the refractive index of the medium. hence when it enters glass u increases hence speed of light dec.
188402
You don't need a force to enable something to travel, it's quite the opposite! Remember the Newton's First Law: an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.\nOf course Newton's Laws doesn't directly apply to light, which is best described by quantum mechanics as a flow of photons. However, I'm referring to it because its rationale holds also for photons and its formulation is very intuitive (opposite to quantum mechanics).\nOnce photons are emitted by a light source (for instance, electrons changing energetic level within an atom), they "just go", with no need of energy other than the energy that produced them in the first place.
966236
No matter how fast you go or think you are going, light always appears to be going the speed of light.\n\nEven if you are going 0.99999999999 c from the viewpoint of an outside observer, you would still see light traveling at the speed of light around you. Now, light sent by objects moving at 0.9999999999 c towards you (those "ahead" of you) would be severely blue-shifted and light from objects moving away from you at that speed (those "behind" you) would be severely red-shifted.\n\nBut light from any object moving the same speed as you would look perfectly normal. In fact if you covered the windows of your spaceship (it better be a spaceship, since you won't be in any atmosphere for very long), you wouldn't know you were moving at all!
718668
Neglecting the fact that it would be imposible to accelate a train (non-zero rest mass) to the speed of light,\nif you did, an observer in the train would still see light moving away from them at the speed of light.\nThe speed of light is constant in all frames of reference.
12961
When the light speeds up it gains mass, so it should loose mass when it slows down.\n\nSo you are right. Light has zero rest mass. So it will be as if it was non existant when its at rest. But we know when light hits any other particles it converts to energy and reveals its presense ( We humans also detect light with eyes, but its similar process of how objects get hot in summer with light ).\n\nNewton's Corpslcular theory can be very good classical explantion of mass/energy relation of light if every were normal classical photon. But we all know that Newton was wrong, and light will not change its direction slowly to conserve energy, but when it hits any smooth surface it retracts immediately. So its velocity at that point of hitting is zero for very very very short periods of time, and again its back to light speed. So your question does not have a classical or quantum explantion, but reltivity theory can be used to understand it.
337266
Um, well it depend on how you consider light. If you consider it as a stream of photons, then you might say that if you measure the positions of each of those photons it doesn't have velocity.\nIf you say it is a wave and always in motion then it is not relative to your velocity, exactly. Even if you were travelling at 30000000mph the light would still appear to be travelling at 3x10to the power of 8 m/s away from you. Light is the fixed speed limit for the universe. But at the far reaches where the material of space itself is expanding into nothing, it is expanding at a speed greater than the speed of light because that speed limit only applies to objects moving within the universe.
292196
Particles travelling at the speed of light cannot be decelerated; any such particle is massless. Since mass is the constant of proportionality between force and acceleration, no force can cause any acceleration of such a particle. \nEinstein's fundamental equation states that the energy E of a particle is the magnitude of its 4-momentum E^2 = (mc^2)^2 - (pc)^2 = (mc^2)^2/[1-(v/c)^2] where p is the magnitude of its spatial momentum vector, m is the particle's inertial mass and c is the speed of light in vacuum. Thus (v/c)^2 = 1 -  (mc^2)^2/[(mc^2)^2 - (pc)^2]. Letting v/c=1, we get mc^2 = 0, which implies m=0.\nNote that this does not contradict general relativity; light particles lose energy in gravitational fields instead of decelerating. Also, light "slowing down" in a medium is due to photons being absorbed and reemitted; the speed of a photon is always c.
746381
No, the laws of physics currently prohibit any type of matter from accelerating to light speed, since it would take an infinite amount of energy to do so.
252752
When the lightwave is traveling in a vacuum, there is no change regardless of the wavelength.  All light travels where there is no matter at roughly 300,000 km/sec.\n\nFor other materials, you would have to look at the dispersion relation for that material.  This will tell how the speed of light at different wavelengths is affected by the material.
226524
A particle  in order to move it must start from a reference point. The velocity of the particle depends on the intensity of the gravitational field . Since the strenght of the gravity field is inversely proportional to a distance. Than the time that a process take place must be different at different parts of the Universe.\n\nSo far sCience has failed to prove that at the edge of the universe there exist such a field  so that the velocity of light would be much different than the reference frame that we measured from on earth.\n\n What seals the containment of the universe into a boundary was only understood by Einstein. No One else did. What are the limits of the velocity of light? We only were able to measure it on earth.But not at the outskitt of the universe.\nThe best answer is I dont know.\nSunthinks if your Soul and Spirit were to travel outside the Universe to Heaven,you certainly would have to travel faster than the speed of light!