what happens if a material turns around at the speed of light?
452520
Well, if YOU make some material turn around at that speed, then I'll tell you what happens!
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.
988641
Awesome question.  I have no idea.  The first thing you would have to know is what the properites of glass are that could, if at all, slow the speed of light.  As well as at what thickness of glass, which, in a backwards loop hole sortof way, directly relates to my last sentance.  (if a piece of glass were doubly thick as a single piece of glass, would it cut the speed of light in half?--depends on how thick the original piece was and if the original piece did anything to slow light's speed at all--see where i'm goin?).  Please tell me what you find, I'm very curious, I love questions that make me think deep.  Peace out dude, rioedgebravo@yahoo.com
592101
The negative of the Speed of Light.
996962
The speed of light is a constant (186,000 mi per second) and does not change based on what it is travelling through.
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
272724
Time for the speed demon will slow down. If you reach the speed of light (theoretically impossible) time will stop, but only for you. In other words, by the time you get back to Earth, Earth will be billions of years in the future, if not much more.\n\nHowever, traveling at the speed of light is impossible. As you increase your speed, your mass increases. This was proven by Einstein by his E = mc^2 equation. Therefore, when you hit the speed of light, your mass is infinite. All the energy in the universe could not move something that had an infinite mass, obviously.
49096
You can't go the speed of light, but even if you were going 99.9999999% the speed of light, yes, you could shine the beam forward, backwards, or sideways, and it would look normal in every direction.  That's the central idea behind relativty.\n\nAnd NO, the light would NOT be going twice the speed of light.  Anyone who says that is BSing you.
30733
If you were traveling at the speed of light, whether or not your lights work would probably be the least of your concerns.\n\nIn reality, the laws of physics prevent any object from traveling faster than the speed of light.\n\nSomething that is perhaps just as interesting, however, is what happens as your vehicle APPROACHES the speed of light.  Take a look at some of the work done by Einstein to get a general idea on that.
120276
The first thing you have to understand is that the speed of light in a vaccum is constant, no matter how fast you're moving, nor how fast the source of the light is moving. This is bizarre. If someone standing on a conver tosses a ball to you at 5 mph while you're standing on the corner, you'll see the speed of the ball as being 5 mph relative to you. But if you're driving at 15 mph and they throw it at you at 5 mph, the speed of the ball relative to you will be 20 mph. This is how most things work. But with light, no matter the speed of the source or yourself, you'll always measure the speed of light as being 299,792,458 metres per second.\n\nEinstein accounted for this by postulating his special theory of relativity, which says basically that the reason for this is because if you move really fast, three things happen: 1) time slows down, 2) mass increases, and 3) length in directions parallel to the direction of movement contract. If you take those three hypotheses, you'll also note that the concept of things being "simulatanous" is a relative term, meaning two observers moving at the same velocity (or moving at no speed relative to one another) will agree on which events are simultaneous and which are not. However, observers at different velocities will have different concepts of what is and isn't simulataneous--and yet THEY'RE BOTH CORRECT. It's pretty mind-blowing, but if you take all of these notions together, you get a consistent view of reality.\n\nThat's Einstien's SPecial Theory of Relativity. About a decade later he formed his far more complicated general theory of relativity.\n\nThe general theory says that Newton's view that gravity operates by exerting a force on a falling object is incorrect. Rather, by general relativty, a free-falling object that is in a vacuum has no forces acting on it at all. The movement of falling objects isn't due to force, but rather the curvature of space-time--massive objects actually curve the surrounding universe. In Newtonian physics, we regard there being three spacial dimensions (up/down, left/right, and backwards/forwards) and a single dimension of time. In general relativity, there are four dimensions of space-time. In Newtonian physics, a foce makes the earth orbit around the sun. In general relativity, the earth and the sun curve the surrounding space-time continuum, and both bodies move in a straight line through curved space, resulting in the perceived sense that one body is circling about the other. In Newtonian physics, light should not bend to gravity, because gravity affects massive bodies, and light has no mass. But in fact, light does bend around stars and such.\n\nGeneral relativity has been likened to a stretched sheet of elastic material, like a trampoline. Heavier objects sink more, and make the sheet curve about them, and light obejcts rolling across are deflected by this curving.\n\nGood luck understanding all that. Hope your head doesn't explode.
214684
No massive object can move at the speed of light, so the question is ill-posed. Sorry.\n\nAs a physicist, please let me give you a little advice: don't loose your time with this nonsense, try instead to focus on the mathematics of the relativity theory, that's the way to understand it. The rest is pseudo-science.
529605
I'll try to explain this in simple terms, but it's rather mind-twisting.  \nThese are the basic principles of Relativity:\n\n1. The speed of light is constant for all frames of reference.\n  Light goes toward you at the same rate no matter how fast you're moving away from the source.  As an example, think about someone throwing a ball at you.  If they throw the ball at 25 miles an hour and you run away from them at 10 miles an hour, then from your perspective, the ball will be approaching you at only 15 mph, because you are running away from it.  But with light, no matter how fast you run away from the approaching light, you will always "see" it coming after you at 186,000 meters per second.  But the light isn't speeding up.\n\n2. Time can speed up and slow down.\n  If you were to get in a rocket and zoom off into space going really fast (nearly the speed of light), and if you were to stay up there for a couple of years (still going really fast), you would come back to Earth to find that a couple of decades had passed.  In other words, even though you would have lived only two years, the people on Earth would have lived 20 years already.  This is because the faster you are moving physically, the slower time moves.  This is not noticeable in everyday situations, because the time change is less than a billionth of a second.  It's only a noticeable difference at really high speeds or with really sensitive atomic clocks, but it has been proven to be true.\n\n3.  No matter (physical thing made out of atoms or sub-atomic particles) can move at the speed of light, or any faster.\n  The faster something is moving, the more mass it has.  So if you were trying to accelerate something to the speed of light, the faster it got, the heavier it would get, and the harder it would be to make it go any faster.  Eventually, it would be too heavy to accelerate.  An object moving at the speed of light would theoretically have infinite mass.  Since light waves aren't matter (they're energy), they can move at the speed of light.  Same goes for gravity waves - they also move at the speed of light.\n\n4.  Space and time are meshed together in something called spacetime, which is sort of the "framework" for the universe - like the paper on which you draw a picture.  Matter (mass) bends spacetime.\n  Picture a trampoline.  If you were to place a ping pong ball on the trampoline, it would make the area below it sag a little bit, but it would hardly be noticeable, because the ping pong ball is so light.  But if you were to put a bowling ball there instead, the indentation would be much larger.  In the same way, larger masses cause more curvature in spacetime.  This concept has two consequences:\n\nA: The closer you are to a large mass, the slower time gets.  So if you were to get really close to a black hole, then time would slow down for you.\n\nB: Remember that going really fast gives you more mass?  Well, this why #2 works.  If you're in a rocket going nearly the speed of light, then your mass is going to be bigger.  That in turn means that spacetime will curve more around you, so then time will pass slower.\n\nThere's a lot morer to it than that, but those are the basics.
921042
If it has a strong gravitational field, light will bend towards it. No sucking involved.
615996
You don't go 'back' because you can't get to that speed.  Time slows for you by the ratio of 1 over sqrt(1-v^2/c^2).\nYou have to get quite close to the speed of light before this is noticable at all.
176611
Time standing still at the speed of light is theoretical.  Consider, however, it takes nearly nine minutes for light to travel here from the sun.  Therefore, if something travelling at the speed of light experiences no aging, it's purely relative.
846625
This theory is formulated by lot of laws and was given by a theory of relativity in which Albert Einstein says that if two things travel in opposite direction with or greater than the speed of light you could look into the future..\nbut it sounds to be impossible ...\nwhile some scientists say that if a object goes near a black hole and a small torque is given to that it starts rotating at a speed nearly equal to light...\n           you can refer theory of relativity for more answers...
1187636
Light always travels at the same speed in a vacuum, the speed changes ever so slightly when it has to go through a different medium (water e.g.) but its so fast to begin with you wouldn't really notice it. 300,000 kilometers per second is beyond human comprehension, I mean you can only imagine how fast that is, you can't experience it or 'know' it.