I read an article about light actually slowing down, meaning that perhaps thousands of years ago, light would've been traveling at much, much faster speeds. Is there any truth to this?

Hmmm... I really can't say...

But new light is always being made... So you would think it wouldn't matter anyways... lol

Actually ive read a book suggesting quite the opposite, Light may be speeding up due to the expansion of the universe accelerating. Faster Than The Speed Of Light , i'm sure you could read a review if you looked it up

In a nutshell, the universe is exapanding and going faster all the time, observed in spectrometer observations of the 'red shift' (similar to doppler) in galaxies receeding from us. Inbetween the galaxies the space is commonly referred to as a 'vaccum' due to lack of, well anything. There is however energy in the vacum of space, a uniform energy that is always the same. As the expansion tugs at the vaccum, the tension it causes replaces energy that disapates outward, but as the expansion accelerates, more energy is created, therefore giving light more energy to flow through and allowing it to speed up.

Eventually, if the theory is correct, the cosmic expansion will eventually exceed the vaccum's ability to remain stable and will result in a big bang (at which time light speed will be at or near infinite), creating matter from energy in the form of hydrogen. (an alternate theory to current big bang theory allowing for a forever expanding universe)

This is just a theory

Since it is a universal event not a local one the only place to detect the change will be outside the universe. that is assuming the other Universe is a static one relative to Earth, while an interesting problems wether the speeding up or slowing down of light won't change the physical laws.

Einsein proved that light, and the "fabric" of space were both affected by the gravity of the planets. *elevator music* ................. Yeah, I cant find the web page right now I'll try later. Anyway this gives way to the theory that if light is affected by gravity, It may not be traveling at its "terminal velocity" yet, and could be slowly speeding up. As far as slowing down, I dont know how that would happen. Keeping the physics of space in mind, the only thing I could think is that it would have to be able to apply force in the opposite direction that it was moving, gradually slowing it down.

ive heard this before also-if im not mistaken the theory is that light just is and that our percieved limitations of light or its speed is entirely the result of the gravity of earth with the sun playing a role as well-i guess we could test it as long as we could attain a great enough distance between the experiment and the sun-

I am currently reading "The Elegant Universe" which deals with String Theory, which deals partly with Einstein and his work. From what I've read, it's been proven that light is affected by gravity, and this is how they proved it. Scientists plot out the location of a star(durring the night) that is in the area of where the sun passes over durring the day. They plan it out so it is like 6 months before a lunar eclypse. So then 6 months later they should be able to see the star (if it were dark outside) someplace around the sun's general location. But since it's so bright, they can't see the star. But when the solar eclypse occurs, they are able to see the position of the star, but now the star is not at the same location it was 6 months prior. It does not occur to be in the same spot because as the light passes near the sun, it is gentally curved toward the sun. As for light slowing down, it can through certain medians (like water, gases, etc.) it can slow down, but I don't think the speed of light through a vaccuum would slow down.

y would light slow down? or speed up? it COULD be but y would it? theres nothing making it slow down, theres no resistance to light, (that i know of). heres something to ponder, according to a certain theory, darkness is FASTER then light, if you think about it before light gets there, there is darkness there waiting for it.

actually i beleive there are certain materials that slow down light, i dont know them off hand though

Many things can slow down light, such as water, glass, gravity and hundreds of other things. When discussing about the speed of light as a constant, it means the speed of light in a vacuum. Any other medium alters it's velocity.

Edit: Just needed to add that the velocity altering mediums can only decrease the speed of light, relative to the speed of light in a vaccum.

So when light is in a vaccum is it at terminal velocity or can it go faster in certain condtiions?

The speed of light in a vacuum is considered a constant 186,000 miles/second, which is considered the universal speed limit