Expanding our observable universe suggestion
Unfortunately, the limit of the observable universe isn't just &quot;photons from the big bang arriving to us now&quot; - so we won't see anything past it because nothing existed before; anything outside that sphere didn't arrive yet. This limit is called the Hubble Sphere, and is only the &quot;first stage&quot; of unobservability - and indeed, as time passes what we can see will expand and we'll be able to see further.
But there's another limit - called the cosmic event horizon - which, to current knowledge, is quite unconquerable. It's connected with space expansion. Space expansion is a phenomenon of far objects &quot;moving&quot; further apart, with the nasty property of bypassing special relativity with its property of light speed being the same in all frames of reference (which would normally imply no matter how far a light source, the light would reach us sooner or later). Instead of classic motion - change of position in space over time - the &quot;motion&quot; due to space expansion is &quot;production of more space&quot; between the objects - they aren't actually in motion relative to each other (or that motion is irrelevant), it's the very definition of distance between them that is changed.
And as result of that, there is a region distant enough, that light from there - traveling at speed of light towards us - will never reach us as there will be always more space inserted between it and us, per unit of time, than it can cover. And so, the cosmic event horizon describes the actual ultimate sphere of the observable universe, not just &quot;for now&quot; but &quot;forever, unless we discover some way to bypass it, but currently not even a hint of such bypass exists.&quot;