There may be megastructures in this expanding universe, for example, galaxies like Andromeda, the Andromeda galaxy is on a path of collision or fusion or peaceful union with our galaxy, something that will happen in about 4000 million years, some say that they have already started in its outer layers, so don't worry, it is not something that will happen now.
But how is it possible that it is coming towards us if the universe is expanding, yes it is true, all the Galaxies move away from us due to the expansion of the universe and the further away they are, the faster they do so is the so-called Hubble law, it is a logical consequence of the expansion of the universe and although it is not that they are all the Galaxies, it is the space itself, it is not the galaxy or the star or the object, it is the space itself that is expanding.
It is compared with an example to visualize it, the expansion of the universe is compared as if we were a dot among many other dots on the surface of a balloon and as the balloon inflates we would see how the other dots move away from us and the further away those dots are, the faster they will seem to move away, because the balloon is inflating.
The energy that inflates the balloon that represents the Universe is called dark energy and we do not know very well where it comes from and why it does what it does. About 5,000 or 6,000 million years ago it made an acceleration that we do not know exactly what was due to. It is a topic of research.
Furthermore, why do all the galaxies in our local group also head towards a common point, the so-called great attractor of the Cosmos? The answer is that in that hypothetical globe the points are not fixed as would happen in a real globe. In that hypothetical globe that represents the universe, the dots move due to other forces, specifically gravity and at a local level, that is, our cluster of galaxies, our cluster of dots, since gravity acts and makes us move faster. of what moves the expansion of the universe.
So Andromeda is approaching us because it is moving faster than the universe is expanding. The Milky Way and Andromeda are part of a group of galaxies known as the local group that are linked by gravity. forever in the distant future the expansion of space between the Galaxies will cause them all to move away from each other, all of them and therefore the Galactic clusters and also the megastructures that exist will break up.
These colossal structures may not be united simply by gravity, perhaps there are other unknown phenomena that unite these structures, they are things that we still have to investigate. If the expansion continues and nothing happens, for example, if the expansion continues forever, it has been calculated that there will be a day. If by then one day makes any sense, there will be a day in which the last black hole evaporates. radiation, nothing more.
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A Googol is a one followed by 100 zeros, a Google is a brutal number, a Googol is greater, a single Googol is greater than the number of hydrogen atoms in the known universe, so the time scale is not infinite because infinity will always be greater than any Googol number.
The creator of Googol initially defined it as a number of one followed by so many zeros until you get bored of writing zeros, then he specified it and said about the 100 zeros.
! The truth will set us free and science is the one that is closest to the truth!
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