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The universe is actually a hypersphere, where each and every point is the center. So there is no "border" to the universe into which it's expanding as such - although it certainly is expanding. I know it sounds like a cop-out, but it indeed seem to be the case.
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I think Boerseun hit the mark here. However, you could say, in accordance to withstanding cosmological theory The universe is considered a hypersphere.
A great way to think of this is that time (or more accurately, the source of time) and distance are intertwined. That means, an imagined certain distance away from an observer, say from earth to the distance of the sun, is not only to be considered a great many millions of miles, but is also a seperation of approx 8 minutes of time, based on stardard time units.
Where an event is an observable action, we can go on to describe: The sun has a present time. That is, it has a series of 'now' moments, just like we do here on earth. When a now moment happens, ie: a coronal flare up, that event takes an amount of time to be observed on earth. As the information travels towards earth to provide a "future" event for us, relative to the sun and how our mind conceives the linearity of time, the flare up event is a "past" event (as we would describe using our everyday mental conception of time). In other words, if we think of this in our mental conception of time this past event from the sun forms a future event for earth.
Time in relation to cosmology does not work the same as our everyday minds conceive time. We know energy is conserved. This means that all events produce other events, and all events are produced from previous events. This is the same as saying, the center of the universe -which is any presently conceived event- is effected by other distant events, and vice versa.
From this, we can explain -in respect to a cosmological model and theorem- that things/events neither move into the past or the future. The linear concept of time we've developed and conceive in our everyday 3 dimensional mind
is irrelevant in respect to a cosmological model. In replacement of this concept we can say observations are energy and energy is conserved, being neither created or destroyed, but can only change form.
Sorry,
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The linear concept of time we've developed and conceive in our everyday 3 dimensional mind is irrelevant in respect to a cosmological model
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I should not use the word irrelevant. I would prefer to say, the linear concept of time we've developed and conceive in our everyday 3 dimensional mind, is, based on our intuition, inaccurately conceived in respect to a cosmological model, or understanding...........
Finally, if we agree that an observation is produced by energy (ie, light hitting our eyes) then, energy that we observe in our present moment can be considered a present time observation of a past time event, as well as -relative to its source- a potential future event in respect of a distance location receiving that light. This goes on to say that how we discern time when making cosmological observations is with energy and/or information.
So we arrive at a final translation that says to us, time is conserved, being neither created or destroyed, but can only change form.
