The speed of light is a relative constant.

The speed of light is constant. But it is also relatively constant because the speed of photons is different in different mediums. The curving photon comes to goal after the photon that travels by using straight trajectories.

And the thing that causes the curving of trajectories of photons is the quantum fields. Outside the universe is no quantum fields. And that means light or photon is traveling there using a straight trajectory. That means two photons can travel in the same direction. But if the other photon travels with a more curving trajectory than the other. That means the other photon that travels less curving trajectory can reach the goal sooner than another photon.

One interesting thing about the photon or the speed of light is that the gravitation affects the photons. That means that the photon that travels to the center of gravitation travels faster than the photon. That travels away from that point.

The speed of light in a vacuum is 299792458 meters per second (approximately 300000 km/s, or 186000 mi/s). But the thing that makes the speed of a photon interesting. Is that the speed of light or photons in a medium like water or atmosphere is much lower. Then the speed of a photon is in a vacuum.

And that thing is seen as the blue light around the nuclear reactors. The blue light is called "Cherenkov' radiation". The origin of "Cherenkov' radiation is in the particles. When those particles travel with the speed of light in a vacuum and hit the water.

Water decreases the particle's speed to the speed of light in water. The energy cannot disappear and while the particle is slowing, it must transfer the kinetic energy to somewhere. When the particle slows its speed it must pump its energy to somewhere.

And the energy that is released during the slowing process is visible as the blue light around the nuclear reactors. The same "Cherenkov radiation" causes the blue sky effect. And the blue flash of the particle that slows its speed is used in neutrino detectors. The flash of the light is also used in the free-electron lasers. When the electron is curving it releases the movement energy by sending photons.

The thing that limits the speed of the light (or the speed of photons) is the scattering. The other photons that impact the photons are slowing their speed. But also the quantum fields around the atoms and other particles cause that the trajectory of those photons is not straight. Because the trajectory of the photon is curving that thing slows the speed of light.

Outside the universe is no quantum fields. That means photons are traveling faster outside the material bubble called the universe. In that case, the "faster photon" means that the photon that travels by using the straight trajectory is at the goal before the photon that uses a curving trajectory.

When we are thinking that the universe is the bubble where all material that we know exists. We might think that photons travel faster outside the universe. The reason for that is there are no quantum fields outside the universe. That means the photon can travel by using a straight trajectory. And that means the light travels faster outside the universe.

The speed of light is not always been the same in the universe. In the young universe, the speed of light was lower than in the modern universe. The reason for that was that the scattering in the young universe was stronger than in the universe today. Youn universe was full of wave movement and traveling electrons where photons impacted. And the trajectories of the photons were more curving than today.

What if we can create the straight-moving light? The reason why we cannot travel faster than the speed of light. Is that we cannot create exhaust gas that crosses the speed of light.

Sometimes there is introduced a simple way to make the rocket that travels faster than light. The researchers must just make the light where photons are traveling with straight trajectories. Straight moving photons are faster than the photons that are moving curving trajectories.

And theoretically, it's enough that the system removes quantum fields around the light source. That thing can make the photons travel faster than they are traveling in regular space. In regular space, quantum fields are making photons curving. And that slows the speed of light or photons.

()https://metro.co.uk/2019/06/10/could-we-ever-travel-faster-than-light-9632400/

()https://en.wikipedia.org/wiki/Cherenkov_radiation

()https://en.wikipedia.org/wiki/Speed_of_light

Image()https://metro.co.uk/2019/06/10/could-we-ever-travel-faster-than-light-9632400/

()https://kimmoswritings.blogspot.com/

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