## What is time?

Question
8 months 1 Answer 167 views

1. What is time?

Time (a second) is just a measurement defined by the set distance (299 792 458 m) that light travels.
Distance (299 792 458 meters) is also just a measurement defined by the set time (a second) that light travels
This is what Einstein called a Space-Time interval.

“according to the general theory of relativity space is endowed with physical qualities; in this sense, therefore, there exists an ether. According to the general theory of relativity space without ether is unthinkable; for in such space there not only would be no propagation of light, but also no possibility of existence for standards of space and time (measuring-rods and clocks), nor therefore any space-time intervals in the physical sense” (read more)

Space -Time Intervals
Space -Time Intervals are defined by ‘measuring rods and clocks’

Einstein’s ‘Space-time interval’ has four properties

Space-time (Second, ‘Clocks’)
Space-size (x,y,z, Meters, ‘Rulers’)
Space-light speed (C, ‘Light Propagation’)
Space-density (Ω, ‘Ether’ or medium)
Everything would have been very simple if it wasn’t for gravity interfering with Space-Density. Now we need lots of complicated math and explanations to get people to figure out what just happened. In reality it is quite simple.

Gravity doesn’t Slow Down Time, it speeds it up?

To understand the process of gravity speeds up time, we need to look at how gravity uniformly affects all space-interval’s properties, not just time (dilation).

Think of our entire universe made up of space intervals, each having exactly the same -time, size and light speed. When you look across space you don’t see a uniform grid, rather you see the grid expanding between galaxies and contracting around stars, planets and towards the center of a galaxy.

What you are seeing is the change in space density affecting each Space interval by squeezing it with gravity or stretching it with dark energy. What most people think is that only time that slows down, but it’s actually all the properties of a space-interval that are changing; time, size and light speed are all uniformly dilating.

Einsteins relativity
This is where Einsteins relativity provides a the explanation from the observers point of view. (Special Relativity)

Albert Einstein’s original pedagogical treatment, it is based on two postulates:

The laws of physics are invariant (i.e., identical) in all inertial systems
The speed of light in a vacuum is the same for all observers, regardless of the motion of the light source.
We note that from an observers point of view they will see the laws of physics and speed of light remain constant. As observers we have our own personal Space -Time-Box (interval) which we call a ‘frame of reference’. If we travel anywhere in the universe, our frame of reference will always measure the same for our three properties, Light-speed, Time, and Size.

Time -Space Dilation
But if we compare clocks from someone else’s frame, we will observe there is a difference.

If we could see two separate space-time frames, side by side, in different gravitational zones, then we would also observe the difference in size.

Gravity is a space density gradient that compresses time, size and light speed, uniformly so they remain relative to each other and the observer.

Did you know the universe isn’t as big as we thought!
Now we can have some fun with relativity and time dilation.

When we look to our feet, we are know that the atoms are moving slightly slower than our head’s atoms, therefore they are slightly smaller and slightly younger because they haven’t had as many cycles as our head.

When we look out into space we know we are looking back through time, but did we realize that time is dilating, therefore light is moving slower through the center of our galaxy and faster away from our galaxy. This means that our light year measuring of space may be totally wrong.

At the moment we measure space like a flat, (constant) space-time interval, whereas we know that it compresses retaliative to gravity and expands relative to Dark energy. We need to account for Time dilation relative to Space density to get a better understanding of distances and time across space.

Time and size is different everywhere in the universe.
Everywhere in the universe time will run at different speeds because of two factors.
1 Space density due to Velocity

Gravity and Velocity are both responsible for time and size dilation and depending on how strong gravity is or how fast you are travelling retaliative to your surrounding space, you will find time will be shorter or longer.

1 Space density due to Gravity

Conclusion
Space-Time intervals are simple to understand when we consider that light speed and size also compress and expand at the same rate of time dilation. This maintains the two postulates of Special Relativity by keeping both physics and light speed always relative in the observer’s frame.

Gravity is one of the factors that compress Space-time intervals by increasing their density, but equally Space-time intervals can be expanded through dark energy outside our galaxy.

Just think of space as a rubber ball that can be squeezed or stretched, quite simple really!