If velocity of light =C,leaving the sun.when reaching  us is  velocity more than C due to  gravity ?
138675
No it is not. \nVelocity of Light is constant.
1046633
The Earth has no absolute velocity.  Velocity is a relative measurment.\nFor example:\nThe Earth is traveling about 33,400mph (not exact) around the Sun.\nThe Sun is also traveling around the center of the Milky Way Galaxy at roughly 672,800mph.\nIf you tried to measure the speed of the Earth from the center of the Milky Way the Earth would appear to speed up and slow down as it revolves around the Sun.\nGuess what else????\nThe Milky Way Galaxy itself is traveling quite rapidly through space.  But I won't go there.\n\nSo, hopefully you can see that there really is no way to state the Earth's absolute velocity.\n\nHave fun exploring Astronomy and the Universe.
960079
You've lost the point of the equation.  Squaring the speed of light will give you the energy released, not an enhanced speed of light.
626127
V = (v + u) / (1 + uv/c²)\n\nTry that. The velocities are quite high so relativistic. Haven't tried it yet though.\n\nNevermind, the velocites aren't nearly high enough to be relativistic. If it was km/s it would work.
1149311
Light does not intend to travel at the speed of light\nLight travels at a certain speed, it actually does not know its speed.\nWhen scientists measured this speed they found it 299 792 458 m / s or about 186000 miles per second \nso they make it fixed term, refereed as "the speed of light", used it in other physical equations...\nthen it "speed of light" became a famous term. \nBut Light still does not know that they called its velocity as the light speed..\nAnd I think it will not know!
351358
The first answerer is right about the mass increase.  As a mass approaches the speed of light, one of the effects is that the more energy you provide it in order to increase its velocity, the more the mass increases, according to Einstein's famous formula E=mc^2.\n\nThe speed of light is the absolute limit for velocity.  A mass can approach closer and closer to this speed, but can never surpass it.  So, to answer your question, mankind can and likely will build spaceships which can go significantly faster than the present-day ones can, but we will never be able to travel at the speed of light.
230173
We would sense the darkness at EXACTLY THE SAME TIME that our planet would fall out of orbit. This is Einstein at heart, that gravity travels at the speed of light. Some recent thoeries say gravity travels slightly slower than light, but this is the best so far. They are equal.
546523
Well according to Relativity Theory it is known that an Object of Mass (M) travelling at Velocity (V) would have a Change in Mass: ie\n        \n          Mass at Velocity (V)  = ( Rest Mass) / sqrt(1-(V^2/C^2) ) \n\nTherefore if we replace C^2 by V^2 then the Whole Equation becomes Infinite. in other Words You cannot Travel at the Speed of Light, because according to Physics an Object cannot have Infinite Mass.
5325
Gravity changes the structure of space-time continum..Thus the linear propagation of light is affected by gravity..\n Light don,t have mass.It changes it's path in a gravitational field not due to it's mass but due to the total change in the space-ime structure.
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
1061558
Moving faster than light isn't really the real issue for space travel as traveling AT the speed of light solves all the distance problems(unless you are interested in time travel!). Of course that in itself is a big challenge. If one could demass the vehicle then surely one could achieve the speed of light!!! Afterall photons do travel at this speed.\nBut we would do very well even with speeds like .99999c because time dilation will reduce the time required drastically. Have the science, just need the technology!
5022
This is the same as the speed of light.  Dark is simply the relative absence of light.  The sun could stop shining and we would not know for like eight minutes.  (Not that the sun would just stop shining, but use your imagination.)
428514
The speed of the graviton, the theoretical virtual particle which carries the gravitational force, is equal to the speed of light (the photon).  No effects (with the possible exception of quantum entanglement) can travel faster than the speed of light, and gravity is no exception.  In fact, if the sun were to disappear right now, our orbit would not be affected for nine minutes, the same time it would take for the light from the sun to cease.
1064893
It's more far-out than that...\n\nNot only is the earth rotating on its axis, it's moving in its orbit around the sun.  The sun (and us along with it) is orbiting the center of the milky way galaxy.  The milky way galaxy is moving through space in a gravitational dance with the local group of galaxies...and while all of this is going on, space is expanding.\nFrom the point of view of an observer at rest, your total velocity when all those factors are combined would be something around 160,000 km/hour.  Yippee! :)
727746
Well we have\n\nwavelength = h/momentum = h/mv = h/m(.0131c)\n\nwhere h is plank's constant and c is speed of light.\nso substitute and calculate.
442563
There's a number of ways to answer this.  Einstein's theory of Relativity says that all things are moving at the speed of light through spacetime, with stationary objects moving wholely in the time dimension.  As you start moving, some of your velocity is directed away from time and in a physical dimension.  When you approach the speed of light, you are traveling very little in the time dimension and mostly in the physical dimesions.  If you actually reached the speed of light you would experience no time whatsoever; your entire trip across the universe would be one instantaneous flash.  However, the faster you travel, the more difficult it is to travel even faster.  When you are traveling relativistically, Newton's second law of F=ma no longer applies.  You continue adding force, but rather than creating acceleration, you'll begin gaining mass.
554157
Here's the rub - nothing can travel through space faster than the speed of light - but since escape velocity (the speed which a body must attain to break free of a gravitaional field) depends on density, if a body of matter is sufficiently dense, the its escape veolcity can exceed the speed of light - meaning that light itself is captured in its gravitational field and cannot break free.