Is there anything besides photons that travels at the speed of light?
I measured the speed of the universe's expansion to be at the speed of light. Since the universe is everything then we can deduce everything is moving at the speed of the expansion of the universe--the speed of light. QED
maybe if you don't define a thing as the sum of its parts; sure if you break anything down enough you'll get a particle moving at the speed of light
otherwise you can see the lack of speed of light as an emergent property of something having mass
It's actually faster than the speed of light and you didn't measure shit. Plus, the expansion of space is not proper movement. Plus whether or not it is moving things apart at the speed of light is totally based on the reference frame. For example, no objects in our galaxy is "moving" away from you at the speed of light or at any speed due to expansion.
>I measured the speed of the universe's expansion
Yes, everything does move at the speed of light, but in different directions. That's the cause of time dilation. An object "at rest" is moving through the 4th dimension at the speed of light, and since speed is constant, the faster it moves in the other dimensions the slower it moves through time.
>otherwise you can see the lack of speed of light as an emergent property of something having mass
Wait, this makes sense to me. Can someone explain why this doesn't make sense please? Or explain further?
I filmed a lamp turning on then watched the clip in slow motion, so I could calculate the speed of photons. Then I paused and zoomed in so I could pinpoint a photon.
I've got notepad open atm, I'll write an article on the experiment this night and publish it on /b/
There is no fixed center of the universe. No fixed point in space exist. So if you take 2 flashlights, point them at each other then photons from both lights are traveling at the speed of light, but in opposite directions. Relative to each other the photons from 2 flashlights appear to be traveling 2x the speed of light.
>Light traveling faster than light.
As far as we know. There are at least five large scale observatories trying to prove/disprove that by observing gravitational fluctuations and comparing them to the light coming from the gravitational objects.
why can photons move at the speed of light and have momentum but not have mass? wouldn't kinetic energy be zero and in turn mean they have no velocity?
also, don't photons accelerate when they bounce off atoms? or are they being absorbed and emitted?
c is speed of light in a vacuum.
It is constant.
Light traveling in a transparent material is slowed down by a ratio that corresponds to that material refractive index.
For example, I've read electrons are faster than light when traveling under water
>Actually he is partially right. This problem arises due to lack of universal frame of reference
In no reference frame is anything with mass moving at the speed of light. Arbitrarily close, yes, but not at c.