Physicist: The best way to think about it is; there is a speed (C) that is the fastest speed and, by the way, light goes that fast. There’s nothing special about light, it’s just a useful way of describing C (“the speed of light”). Photons are just another podunk massless particle, whipping around the universe as fast as fast can be.
Historically, the derivation of the strange properties of C (relativity) relies on a pretty straight forward piece of Einsteinian logic, based in part on an understanding of light.
1) All the laws of physics work the same, whether you’re moving or not. There is no experiment that can tell you whether or not you’re moving.
2) Light is an electromagnetic wave, and the velocity of these waves can be derived from Maxwell’s laws.
3) Maxwell’s laws, like all physical laws, are independent of how fast you’re moving. So the speed of light must also be independent of how fast you’re moving.
4) So, there exists a speed (the speed that light travels at) that is the same to everyone, no matter how fast they themselves are moving. Holy crap! There’s your special relativity!
So when you see equations like 
So why is C the fastest speed? A good way to think of it is to first ask; how do you know when you’re moving faster than something else? If you’re driving down the highway and you’re moving faster than the car in front of you, then eventually you’ll pass that car. However, C is the same to everyone, no matter what. So, say a photon goes past you, and you try to catch up. But no matter how much you speed up, the photon will always be moving away at the speed of light. You can never catch up (or even come close to starting to catch up). So, regardless of perspective, the photon is always moving faster than you.
Some of this may seem seem contradictory, but surprisingly, it’s all self consistent. Very surprisingly.
Question – If you drive away from a large clock at a speed near C for 1 whole day and then drive back to it at the same speed, what would the clock show on each of the journeys?
Here’s what I thought:
On the journey away from the clock you would see it “freeze” and on the journey back you would see it …? move at double speed?
THE SOL IS NOT THE FASTIST SPEED IN THE UNIVERSE…MAN HAS NOT REACHED THE TECKNOWLEDGE TO SOLVE IT YET… AND WHEN HE DOES HE WILL BECOME THE MASTER OF THE OF ALL CREATION…
All photons move at the same speed and seem to have an infinite range, i.e., we can see distant galaxies that are billions of light years away. I assume that all photos have the same “mass” or “energy level” since all travel at the same velocity, “C”. None observed travel at slower speeds which would imply all are “launched” with the same force but in the randomness of nature, why would this be? Even in space, there is some dust, so how are photos able to travel for infinity without any means of propulsion other than the force that launches them?
Light is EM energy given by hf and has no mass. All frequencies f of light are photons that must travel at intrinsic speed c= E/B whether high energy gamma or low energy radiowaves or all frequencies in between. This is determined by the ratio of the electric E and magnetic B fields but not by the enegy of the photon where E and B increase proportionately with energy. Since light has no mass force is not developed by physical objects, it is not subject to gravity, and it experiences no friction. However light can refracted or reflected or scattered or absorbed by matter depending on its chemical attributes. Light can travel in perpetuity since it has its own oscillating fields that self-induce and self annihilate each other while propagating forward when uninterrupted by absorbing matter.