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Varying Speed of light?


Do you think the speed of light changes?  

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  1. 1. Do you think the speed of light changes?

    • NO!
      8
    • Yes
      7
    • I'll wait for that experiment of his.
      4


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I try to understand all the nuances of relativity but it seems to me that if an object is moving away from you at the speed of light you could imagine that it left a trail of photons stationary along its path as it travelled. They would never reach your eyes. Is that the way it is?

Just aman

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Okay, someone back there said that the object moving at the speed of light away from you would result in the reflection from ever reaching you, but we know the just because it hits a moving object towards you (usually a train in explainations) its not "Lightspeed plus 60mph" the same would apply for moving away. Thats why light is red or blue shifted due to the doppler affect which applies to all waves either being compressed or stretched as a result of the object they have been reflected/created by. So if its moving away you will see it mearly as it was at the point of light reflection (ie.. the past).

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so, the theory says that as the universe has been expanding then light speed has been going through various phase changes, i like this theory because it solves a lot of the "cosmological problems" without invoking 'dark energy' and 'dark matter' and there's no fudge factor, 'cosmological constant' or 'quiescence'

 

it was ridiculously fast in the beginning, then it phase changed and slowed to a different speed, we are in one of those phases now where light travles at 300,000 m/s

 

to answer earlier posts, light travels at one speed (nowadays), period

when someone says "light travelling through a medium" they mean that photons are being absorbed and re-emitted throughout the material, atom to atom, so to speak

 

but light ONLY travels in a vacuum, and at ONE velocity

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