Internal or external causes of the acceleration of the expansion of the universe.

The European space agency has published a mosaic of 208 gigapixel images, taken by the new Euclid space telescope. It is a mission in which NASA also participates. Euclid was launched in 2023 to study why the Universe is expanding at an accelerated pace, astronomers use the term dark energy, but they do not know what it is, called “dark” because currently “dark” is used to say what is not known, to name the unknown, for example, dark matter and in In this case, dark energy and energy is because we know what it does, what it does is expand the universe, but we do not know the reason why it exists and how it works.

And the truth is that it works in a very strange way, the current theory based on everything we currently know, if something new is discovered in the future it will obviously have to be changed, but everything we currently know leads us to this theory, and that is that About 13.8 billion years ago the Universe expanded rapidly in what we call the Big Bang, it was everywhere and in all directions. After this initial expansion that lasted a fraction of a second, gravity began to slow down the universe.

Gravity began to act and began to make the Universe expand more slowly. In fact, there had to have been a point at which gravity overcame the expansion force of the Big Bang and the Universe contracted again to merge into one. new singularity or a point without dimensions or rather with all dimensions, but all compressed and and all the mass and all the energy compressed in that single point, is typical of everything that goes up and down would have been normal, logical, mathematically known, but something illogical happened.

We have discovered that when the universe was already mature and there were galaxies like ours and solar systems and planets like ours, the expansion of the universe, instead of slowing down due to the action of gravity, began to accelerate, driven by an unknown force at the time. What scientists call dark, we have no idea why that happens, it may be due to some internal cause, or it may be a cause external to the universe, there is a debate right now.

I think those who defend that possibility are winning right now because those who defend the possibility that this acceleration, that change in acceleration due to an internal cause are not finding evidence, but the point is that we have Euclid working and Euclid is the one can provide us with that evidence and determine what happened, if it is due to an internal cause, if it is due to an external cause and above all what is going to happen to the universe, is it going to hit another acceleration, is it going to continue in this race towards unlimited expansion until the end of time times, the universe is going to end, becoming a gigantic void, it is one of the great enigmas.

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