which is the fastest in universe? light or darkness. ans with explanation please.?
157107
Interesting question.  Actually, it may be that 'darkness' is faster than 'light.'  In the universe, there appear to be vast regions of nothingness, like the inside of soap bubbles, that are expanding in volume as fast, or even faster, than the speed of light.  \n\nIt seems like the presense of nothing (or more precisely, the lack of anything at all) has a very weird effect on the 'fabric' of space-time, causing it to expand more rapidly than space which is near to 'stuff.' \n\nThis is called 'zero-point vacuum energy' and plays an important role in modern views of cosmology.
933622
Nothing is faster than light
16971
dark is merely the absence of light, so since it's not something physical, it can't have a speed.
194843
The speed limit of the universe is the speed of light in a vacuum, nothing with mass can obtain this speed or go any faster.\nIn a vacuum, light will propograte at the speed of light.  In any other medium, light slows down, it does not speed up (your thinking of sound waves that travel faster through denser mediums).\n\nThe inverse of time (unit: second) would be 1/t (or 1/second).  To an average person, this unit wouldnt mean anything, however, you sometimes will see data graphed nothing using time, but the inverse of time on the X axis.  This is done to make the graph easier to understand, since of course, happiness is a straight line.\n\nAny amount of time you can think of can be reduced into a smaller amount. 1 second?...1/2 second.  A nanosecond?...an attosecond (E-18 s).  You can always find a smaller unit, there is no absolute unit of time.
144613
light rays do not move faster or slower than the speed of light.  the speed of light is the speed of light, period.\n\nthat said, light often travels *slower* than c, which is a constant defined as the speed of light IN A VACUUM, approximately 3x10^8 m/s.  here is a way you can actually observe some honest-to-god light traveling slower than c:\n\nstep 1.  find a window.\nstep 2.  look at it.\n\ncongratulations, you have observed light traveling slower than c.  in ANY medium (air, glass, water - you name it) the speed of light is slower than the speed of light in a vacuum.  \n\nin fact, the so-called index of refraction (n, which equals 1.4 for glass) is defined as the ratio of c to the speed of light in that material.  generally, denser materials have a higher index of refraction, and people have been able to make light go REALLY slow by making some very dense materials.  all of this is perfectly consistent with general relativity.\n\nas for FASTER than c:  under certain conditions, it is possible to make photons with a "phase velocity" that is greater than c.  however, when people speak of the speed of light, they usually refer to the "group velocity".  the distinction between phase velocity and group velocity is kind of technical; but phase velocity refers to the speed at which the individual phase fronts propagate through space.  \n\nit is possible to make these phase fronts go faster than c; but because the energy or information or whatever carried by the light travels at the group velocity, the actual speed (as far as stuff like general relativity is concerned) is still less than c.\n\nanyway, all of these results are entirely consistent with general relativity.  in fact, i don't know of any published results of a scientific experiment which are not consistent with GR.  \n\nthe fact that einstein's theory, largely concocted out of the blue from basic principles and logical reasoning, has stood the test of time for so many years is a testament to the genius of the man's work.\n\nhere are some links to learn about phase velocity, group velocity and the speed of light:\nhttp://en.wikipedia.org/wiki/Group_velocity\nhttp://physicsweb.org/articles/news/4/7/8/1
70622
Time does not exist.  Really.\n\nHey USHERFAN- light travels at 186,288 miles PER SECOND.   Just a LITTLE bit more than your guess.  Stick to the R-a&B.
532470
Darkness... the opposite of light! well i worship the sun. i find it the only thing beyond us all! it's been there the whole time! holds the proof of all living! were as darkness is mysterious! darkness symbolizes what the sun cant reach!and i find it rather impressive! watch the beam of light trying to reach out through the darkness... weak isnt it?
426747
The speed of light is a measurement of how fast light travels in a vacuum. The speed of light also known as "c" as in the famous Einstein equation E=mc^2. And its equal to 299,792,458 m/s or in U.S miles per hour is about 670million miles per hour!!!!!!! It would take light coming form the sun only 8 seconds to arrive on earth which is 92million miles away. Now say "WOW!!"
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.
4167
Darkness is the absence of light, although earlier in history it was sometimes viewed as a substance in its own right. \nLooking at this definition, if we were to define what is "speed of light", it would be the speed at which light is leaving a point. And the speed at which light can travel through any point is the constant 'c' used to define the speed of light. \n\nThe speed of light in a vacuum is defined to be exactly 299,792,458 metres per second (or 1,079,252,848.8 km/h, which is approximately 186,282.397 miles per second, or 670,616,629.4 miles per hour).\n\nSpeed of Dark is a Book\nHere's the detail's\nThe Speed of Dark\nElizabeth Moon\nBallantine Books, $23.95, 340 pages, ISBN:03454475570
678445
There isn't a speed of dark...Darkness occurs only when there is an absence of light. Therefore the speed of dark will reflect the speed of light dissipation.
7206
To be precise, what we usually call the "speed of light" is really the speed of light in a vacuum (the absence of matter). In reality, the speed of light depends on the material that light moves through. Thus, for example, light moves slower in glass than in air, and in both cases the speed is less than in a vacuum. However, the density of matter between the stars is sufficiently low that the actual speed of light through most of interstellar space is essentially the speed it would have through a vacuum, so we don't make much error by ignoring the difference.\n\nTo make it easier for you to convert, here is the speed in alternative units :\n\n(1) 983,571,056.4304461 foot/second\n(2) 11,802,852,677.165352 inch/second\n(3) 1,079,252,848.8 kilometer/hour\n(4) 299,792.458 kilometer/second\n(5) 582,749,918.3585312 knot\n(6) 880,991.0899527 mach\n(7) 670,616,629.3843952 mile/hour (mph)
15796
Its not proven but heres how eistine put it.\n\nThe faster you travel the more you weigh. Since light is the fastest moving thing in the universe if you went faster then that you would way infinite pounds and that would be impossible so you cannot go faster than the spped of light
753670
The speed of light varies depending on the medium the light is traveling through.  In a vacuum however, which is the fastest medium in which light can travel, the speed of light is 299,792,458 m/s.
1074904
This can be proven with a simple experiment.  Light travels at 186,000 mps, if you go to a desk or anything with a drawer that can be pulled out, while the drawer is closed it can be fairly safe to say that it's dark in the drawer.  When you open the drawer you will find that the dark excaped before the light got in.  So, you can safely say that darkness travels faster than the speed of light.
897838
Hi. Space is not a complete vacuum. There are a number of hydrogen atoms throughout. A few per cubic meter. But if you think about it, light can reach us through billions of light years of space, so it is a very good vacuum if not a perfect one. And any material should SLOW the light. 'c' is still the fastest speed.
474792
(m)\n\nThe speed of light in a vacuum is exactly 299,792,458 metres per second (or 1,079,252,848.8  km·h-1, which is approximately 186,282.397 miles per second, or 670,616,629.4 miles per hour). This value is denoted by the letter c, reputedly from the Latin celeritas, "speed", and also known as Einstein's constant. Note that this speed is a definition, not a measurement, since the fundamental SI unit of distance, the metre, has been defined since 1983 in terms of the speed of light—one metre is the distance light travels in a vacuum in 1/299,792,458 of a second. The speed of light through a transparent medium (that is, not in vacuum) is less than c; the ratio of c to this speed is called the refractive index of the medium.