I don’t pretend to know very much about science and how stuff works. But I was watching a documentary about infinity and the question was raised about the nature of our universe: is it finite or infinite? The two proposed solutions to this problem are both equally incomprehensible. Let’s assume that the correct answer is that it is infinite. That means we have no chance of ever reaching the boundaries of the universe, because they simply do not exist. And that is a difficult concept to grasp. The balloon analogy is often used as a visual representation of the infinitely expanding universe: imagine that the balloon itself is the entire universe, and as you blow it up it becomes larger in all directions. Some say that that is what the universe is doing too. But even that analogy does not adequately represent the theory that the universe is infinitely expanding since, eventually, a balloon can no longer become bigger and it will burst.
The second theory is that the universe is in fact finite, and its diameter is a measurable constant, theoretically. But that is equally difficult to comprehend: if the universe has boundaries, what is beyond them? We assume that we cannot escape the confines of the universe, and that is true of both theories. But if we could, what would be there waiting for us? Rational cognition does not allow us to be able to imagine an environment where literally nothing exists.
This got me thinking, maybe there is another possibility. What if the universe is expanding, but is not increasing in size? By that I mean, what if the density is changing? Imagine a black hole for example: they constantly increase in mass, but the size of them appears not to grow at the same rate as the size of the matter that constitutes their make-up. Hypothetically, if the Sun was to become a black hole (which is impossible due to its relatively small mass) it would only have a diameter of 3km, but its mass would still be the exact same as it is now. That means that all the material that forms the Sun’s 1.4 million km diameter, would be compressed to a 400,000th of its current size, roughly.
So, if we know for an absolute certainty that matter can remain the exact same size in terms of mass, but occupy a much smaller portion of the universe, could that be what is happening to the universe as an entire entity? Let’s hypothesise that we are becoming denser: although you would assume perhaps that we would notice as that would imply that we are becoming smaller, and that we can measure size as it is quantitative, maybe that isn’t quite so true. What if our rulers are also getting littler? We are only able to measure distances relative to their surroundings. So if EVERYTHING is condensing, it follows that the proportion of everything in relation to everything else observable is still constant.
What I’m trying to say, perhaps without much coherence, is that the universe could be expanding, whilst also staying the same size. If everything condenses to make room for new things, then the balloon can be indefinitely blown up. The problem I have in coming to terms with this theory, or indeed the two preeminent theories, is thus: from my understanding of the laws of physics, you cannot create energy/matter/etc, everything is recycled, so if new celestial objects are being created, from whence did the matter and energy required come? Dark matter? Dark energy? We know very little about these two phenomena, so what if I hypothesise that they can disappear entirely. Not be recycled, and not transfer their energy elsewhere, just vamoose. We assume that dark matter constitutes roughly 80% of the mass of the universe, even though we cannot see it. Well what if it can completely vanish from the universe altogether? Then the universe could remain the same shape and size, but decrease in density. In other words, the stuff in the blackness we call space could expand outwards, without the universe becoming larger. Isn’t that like a black hole? What if all the black holes in the universe suck in matter and then they evaporate, which we know to be true? Then would there not be space for other stuff to occupy?
I have just confused myself. Over and out.