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**Physics, Astronomy & Cosmology / Does time dilation and length contraction apply to light?**

« **on:**06/04/2024 21:40:07 »

This was inspired a bit by something I had been corrected about earlier. There was a discussion in another thread about black holes where I stated that black hole singularities had infinite density. I was corrected about that assertion in that relativity doesn't predict a density for a singularity (the math doesn't give a number for an answer). I then began to think about my other conceptions regarding relativity...

I had been under the assumption that time is frozen for light because it travels at the speed of light. Likewise, I had assumed that the entire universe was also length contracted to zero along the light's direction of movement, meaning that it was simultaneously at its starting and ending points (thus explaining how it can arrive at its destination despite being frozen in time). Then I took a look at the equations again.

It seems that length contraction doesn't give an answer when the speed is put in as the speed of light. Doing so yields a zero in the denominator, and dividing by zero doesn't give a sensible answer. The same problem pops up with the time dilation equation.

So would it be more correct to say that special relativity doesn't predict the length contraction or time dilation for light? Or am I missing something?

I had been under the assumption that time is frozen for light because it travels at the speed of light. Likewise, I had assumed that the entire universe was also length contracted to zero along the light's direction of movement, meaning that it was simultaneously at its starting and ending points (thus explaining how it can arrive at its destination despite being frozen in time). Then I took a look at the equations again.

It seems that length contraction doesn't give an answer when the speed is put in as the speed of light. Doing so yields a zero in the denominator, and dividing by zero doesn't give a sensible answer. The same problem pops up with the time dilation equation.

So would it be more correct to say that special relativity doesn't predict the length contraction or time dilation for light? Or am I missing something?