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In summary, at speeds below the speed of light, we experience one axis of time and three of space. However, at the speed of light, space and time unify and we experience four isotropic axes of spacetime, which are identical dimensions. This does not affect our experience or perception of space and time, as we are always at rest relative to ourselves. Therefore, the presence of an observer at the spatial origin of a frame is not necessary for transformations between frames.

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There are no inertial reference frames going at the speed of light.

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brianhurren said:

No.

You should consider that you are always at rest relative to yourself so no matter what your speed is relative to someone else, you get the same four axes and the same experience as someone at rest. Right now you are moving at .99999c relative to some observer in some far distant galaxy somewhere... does that affect what you're experiencing or your notion of how the space and time around you is behaving?

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Why does there have to be an observer at the spatial origin of every frame? When we transform from one frame to another, there is no observer at the spatial origin of the new frame, not even conceptually.Nugatory said:No.

You should consider that you are always at rest relative to yourself so no matter what your speed is relative to someone else, you get the same four axes and the same experience as someone at rest. Right now you are moving at .99999c relative to some observer in some far distant galaxy somewhere... does that affect what you're experiencing or your notion of how the space and time around you is behaving?

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I find this concept of exploring 4 axes of spacetime and understanding the unification of space and time to be very intriguing. It is true that at speeds below the speed of light, we experience one axis of time and three axes of space. This is known as the 3+1 dimensional spacetime model.

However, as we approach the speed of light, space and time become unified and we enter a new realm of spacetime known as 4-dimensional spacetime. In this model, we experience four isotropic axes, meaning that all four dimensions are identical. This is because at the speed of light, the concept of time as we know it breaks down and becomes inseparable from the three dimensions of space.

While the idea of 4 identical dimensions in spacetime may seem counterintuitive, it is supported by various scientific theories, such as Einstein's theory of relativity. This concept has also been confirmed through experiments, such as the famous Michelson-Morley experiment.

In conclusion, the statement that at the speed of light we experience 4 isotropic axes of spacetime is indeed correct and is a fundamental concept in our understanding of the universe. It highlights the intricate relationship between space and time and how they are intertwined in the fabric of spacetime.

The 4 axes of spacetime refer to the dimensions of our universe: length, width, height, and time. These axes are used to describe the location and movement of objects in the universe.

The 4 axes of spacetime are closely related and are often referred to as the fabric of space-time. Length, width, and height make up the three dimensions of space, while time is considered the fourth dimension. Together, they create the four-dimensional continuum that makes up our universe.

The concept of 4 axes of spacetime is significant because it allows us to understand and describe the behavior and movement of objects in the universe. It also plays a crucial role in Einstein's theory of relativity, which explains the relationship between space and time.

The 4 axes of spacetime affect our perception of reality by showing us that time is not a separate entity from space, but rather a part of the fabric of our universe. This challenges our traditional understanding of time as a linear concept and helps us understand the interconnectedness of all things in the universe.

While we can conceptualize and understand the 4 axes of spacetime through mathematical equations and scientific theories, it is challenging to visualize them as they exist in a four-dimensional space. Some scientists use models and simulations to represent the 4 axes, but it is ultimately a complex and abstract concept that can be difficult to visualize.

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