I would like to argue that our own place in time and space is the exact location from where the universe expands. Our own moment in time (now) and location in the universe is the exact place from where we leave our own action into the past while we "travel" into the future while we create or shape the future.

For this moment I am not sure if this rather is philosophical or if this is also a possibility in the "real" reality. So I love to hear some thought about this concept of spacetime and the idea that "now" is the absolute boundary of the expanding universe.

This would say that we all are living as "multi entities" or parallel universes next to each other from where we all create a unified universe. Looking forward to some thoughts..

This is somewhat Philosophical.
It is the very idea that allows us to do science, and it is called the Cosmological Principle.

"The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the universe which we can see is a fair sample, and that the same physical laws apply throughout. In essence, this in a sense says that the universe is knowable and is playing fair with scientists."

Astronomer William Keel from https://en.wikipedia.org/wiki/Cosmological_principle

IOW, this means that the universe looks the same from everyone's perspective, has no special center or edge, and that the laws of physics are the same everywhere and at all times.

Edited November 22Nov 22 by MigL

4 hours ago, Rudolf said:

I would like to argue that our own place in time and space is the exact location from where the universe expands.

For us, sure. But it’s true for anyone else, wherever they happen to be.

20 hours ago, swansont said:

For us, sure. But it’s true for anyone else, wherever they happen to be.

Yes that´s truth. Since I think the edge of the universe is our own place in space and time this edge is not just a line between 2 parts of space but also a line or moment in time between past and future. We all expand this boundary by the thing we do. You might compare the universe with the surface of a ball. Each dot on its surface is on the edge of "inside or outside" the ball. So anyone can be on the edge from where the expansion takes place in his own spacetime "bubble".

22 minutes ago, Rudolf said:

So anyone can be on the edge from where the expansion takes place in his own spacetime "bubble".

Due to the finite speed of light/information, and the universe's finite age, our specific Cosmological Horizon limits what can affect us and what we can observe from the center of our horizon.
It is currently defined by a radius of about 46 Billion Light Years, but it grows with time.

There are also horizons in time. The past one being defined by the CMB, or surface of last scattering, beyond which light can't observed ( butneutrino and even gravitational waves may eventually provide previous horizons ).
And the future one defined by the Event Horizon, which events will never be able to affect us, even in the future.

On 11/23/2025 at 6:50 PM, MigL said:

Due to the finite speed of light/information, and the universe's finite age, our specific Cosmological Horizon limits what can affect us and what we can observe from the center of our horizon.
It is currently defined by a radius of about 46 Billion Light Years, but it grows with time.

But what I would like to argue is the idea that this "grow" happens from here at our own place and moment in time. Do we shape our own part of the universe by our own actions in spacetime? We only see the past while we create the future.

30 minutes ago, Rudolf said:

But what I would like to argue is the idea that this "grow" happens from here at our own place and moment in time.

But as @swansont pointed out, everybody else can say the same thing regardless of where they are. That is the nature of an expanding universe. Regardless of where you are in it, the universe will always appear to expand away from you.

I don't see how we 'shape' our part of the universe, or 'create' the future.
We interact with the only part of the universe that the speed of light/information allows us to.

If that is what you are saying, then ... yeah; but it's no big revelation, it is a fundamental principle.

On 11/25/2025 at 12:15 AM, KJW said:

But as @swansont pointed out, everybody else can say the same thing regardless of where they are. That is the nature of an expanding universe. Regardless of where you are in it, the universe will always appear to expand away from you.

On 11/25/2025 at 12:16 AM, MigL said:

I don't see how we 'shape' our part of the universe, or 'create' the future.
We interact with the only part of the universe that the speed of light/information allows us to.

If that is what you are saying, then ... yeah; but it's no big revelation, it is a fundamental principle.

Certainly, the universe is expanding from our point of view. I think anyone can grasp that.

But no one has any idea what might be at the far edge of the universe; perhaps we can see the birth of the universe there, and there are various theories about that. What I like to argue here is that where we always perceive the past from ourselves (we are always looking further back in time), we create the future also by ourselves. I would dare to suggest that we generate time and space from the absolute present at a speed equal to c.

Mass generates time and space. The latter seems to me to be a new insight by itself, which could explain gravity.

Edited November 27Nov 27 by Rudolf