# The Amazing Light We See

Let's talk about the amazing light that gives us our vision of the world.

My first book in the series Einstein was about light.

Einstein: Blindsided By The Light discussed that light must have some mass, like neutrinos.

The fact that we can see and feel light is observable evidence.

I never thought that time had anything to do with motion, except we use the time on a clock to measure speed.

My third book Einstein Misled By Time, talks about time itself. What is time, and how does time work or even exist?

Do we observe time passing or motion passing? Is time moving or light moving? If light is moving in space, is time moving in space?

I tried to examine all aspects of time, but I kept seeing new questions and new ways to answer questions. Finally, I had to end my book, or it wouldn’t ever be published.

Still, I wonder if Einstein’s relativity is holding the evolution of science in a cell where we can’t think outside the box containing our imprisoned school of thought.

I'm feeling philosophical today, lol.

## Time and the Speed of Light

All light travels at the same speed of ‘c’ in every medium. Let me explain.

Einstein said that the speed of light is constant in all frames of reference.

But, in his special relativity, he said time is relative to your frame of reference because of the finite speed of light.

Does the speed of light change a clock's time?

Einstein's theory uses the speed of light to measure time. That's not right because time is what a clock shows and can't be measured.

Time is a measurement of motion which we call time. The duration of an event is measured with a clock, and the time is a motion measurement.

Individual photons always move at the speed of light because all electrons are similar, depending on their frequency.

An electron continuously emits a photon at the same speed and frequency the electron has. If you didn’t know, photons are only made by electrons.

It doesn’t matter what the medium is. Electrons always emit photons at the speed of light regardless of the frequency.

But a photon can’t travel very far in a medium without getting absorbed into another electron.

The electrons in a medium act like a stop-and-go traffic light sending a photon back out in the same direction that the original photon was traveling.

That’s why the speed of light is slower in a medium. When a photon leaves the medium, it travels at the speed limit in air, which is very close to the universe's speed limit.

## Why Light Moves Slower in a Medium

Let’s examine why light moves slower when it enters glass.

A photon is the smallest particle in the universe, and when it enters glass, it's absorbed into an electron’s energy, and immediately the electron emits a new photon.

In case you didn’t know, electrons create all light.

The new photon moves at the speed of light the electron gave it until it hits another electron.

The process of stop and go is like traffic lights on a street.

This process slows down the travel of light in glass, but when a photon leaves the glass, it's free to resume at the speed of light.

In the case of sunlight, the same process slows down the motion of light in the atmosphere.

We see fantastic sunsets because sunlight loses energy and redshifts its frequency as it moves through the dust and moisture during a sunset.

## Seeing The World With Light

Some scientists don’t understand how light reacts with objects to show us things.

Light has enough energy or frequency to reach the electrons surrounding the surface of matter.

The electrons absorb the photon energy, and the electrons reemit photons that enter our eyes. Then, we can see the corresponding light as shapes and colors.

For example, when Light enters a room, trillions of tiny packets of photons land on all the objects and walls in that room.

When light travels through glass, the same process happens. Photons are absorbed by electrons and remitted as photons until they have moved through the glass.

At the exit surface of the glass, photons resume in the same direction and energy they had before entering the glass.

I hope you like my answer that describes why the speed of light is constant in all frames of reference, but the average speed is slower in any medium other than a vacuum.

## Is there an easy reason why light has a speed limit?

Here’s a straightforward answer to why light has a speed limit.

The universe began to move into space at the speed of light about 13.8 billion years ago.

And it’s still moving at the same speed limit. It can’t expand faster into space than its moving speed. The future doesn’t exist in a location.

So, nothing can move forward faster towards the future than the universe's speed limit.

That also means nothing can move backward to the past that doesn’t exist.

The only moment in the universe is the present moment that we are experiencing.

This simple concept seems challenging to comprehend, but it makes sense and answers your question.

Sorry to spoil your plans for time travel, but that's our present knowledge of science.

At https://lovinthings.com I want to help the public understand science instead of science fiction.

I appreciate all my followers. Take care, and be well. xoxo

### About the Author Erik Lovin

Erik has a BSc degree and is a retired professional photographer who is now a published author of many books. His passion is understanding how life and the universe work. He is currently blogging about the science of the Big Bang and science in your life. Erik is helping his tribe with questions about the universe. His goal is to help find a theory of everything (TOE). In order to do that, he is trying to prove light has mass and that the fabric of spacetime is a false theory. We are welcoming questions and answers that you might have about the universe.