The world as we know it is not endless. A lot of people wonder, if the universe is finite, it must be part of something.
Such questions will never end, even though one day we will know what lies beyond the borders of the universe.
The universe is just a grain of sand in a galaxy
Our universe was born from a big bang. This explosion had to come from a singularity with an indeterminate, and perhaps unlimited density, after the creation of this space and the explosion time, first the light radiation, then gradually to form heavier elementary particles, which merge together in the smallest atoms, molecules, particles of dust and gas, and the end result is galaxies, stars, planets … and all of our life today.
Based on today’s data, we estimate fairly correctly that the big explosion mentioned above occurred over 14 billion years ago, 10 billion years later when our Earth was born, and that humans have intelligence. Wisdom did not appear until about 15,000 to 20,000 years ago (mid and late ice age).
For a long time, man has been constantly learning his origin in the universe. Through the thousands of erroneous years of believing that we are the center of the universe, the cognitive revolutions from the time of the Copernicos, the Galilees (16th and 17th centuries) until this time when we went beyond 10 years in the 21st century, told us more about where we really are
We’re not just microorganisms on a planet orbiting the Sun, but the Sun itself isn’t the only star, it’s just one of 200 billion stars in the Milk Way galaxy. .
Although this galaxy is only one of more than 50 members of the local group, a cluster of galaxies is part of the Virgo supergroup – one of the thousands, millions, or billions of galaxies in this universe.
Yet up to this point, the farthest place man has ever set foot is the Moon, one of our satellites. The number of 384,000 km between the Earth and the Moon seems large compared to the daily measurement. But let’s try the comparison.
With speeds of up to about 300,000 kilometers per second, light takes a little over a second to bring an image of the Earth to the Moon, but it will take more than 50 billion years to reach the edge of the pillar of the universe. Perhaps our civilization in the next few hundred years will hardly allow us to get out of this tiny galaxy.
However, even though it is not possible to travel alone to deep space, people still keep watching it. So far, we’ve been able to get signals from places billions of light years away (even though it was information about them billions of years ago and maybe not even a few billion at that time. Light year).
The universe is a multidimensional space (more than 4) and it also has its limits, which are increasing due to constant expansion. Studies in recent years have shown that our universe is unlikely to end in collapse and material collapse, it just keeps expanding, diluting the density until all interactions are gone.
Even so, no matter how much the universe expands, it’s still just a balloon that’s inflated, it can keep growing and growing, but in the end it has to have a limit.
What is there outside the universe?
So far, there is no evidence of the existence of anything outside the universe, but a model called a multiverse is still concerned by many people because it explains that the odds of universes and of life exceed our limits.
Essentially, the multiverse is just a proposed model based on the multistage hypothesis and probability in quantum mechanics.
It is sometimes called parallel universes whose main content is that our universe is not unique, but there may be other universes that exist parallel to us. This multiverse theory has 4 forms of division instead of 4 with different differences from our universe.
Level 1: There are other universes independent of ours. They also have the same physical properties which we made no difference except for different probabilities and internal conditions which will produce different results.
Maybe there is a life like us, there is a civilization like us, there is only a slightly different nature. Currently, a rather fuzzy evidence for this is a multi-point disagreement in the resulting background radiation.
As we know, this background radiation is emitted shortly after the Big Bang and spreads through the universe, what we get today is its remainder, so it is the witness of the early universe. S
This inequality in this background of radiation poses the question of the collision of the magnetic universe with other universes as proposed by the multiverse, of course until now, these are only questions.
Level 2: At this level, we see the multiverse as “bubbles” born in empty space. These bubbles can be pushed aside as galaxies separate in our universe.
In this hypothesis, there is a difference. The physical and mathematical equations are still not different between universes, but not only the initial conditions are different, but also the physical constants are also different such as the speed of light, the gravitational constant. The results are due to the different material structures.
Level 3: This is the multi-historical / multi-world hypothesis that we encounter in science fiction films. There may be worlds that are parallel to us but with other constants lead to different consequences. Like a mechanical cat
Doraemon, in fact, when the robot cat Doraemon returned to the past to help Nobita, it was a different world and story, whereas the original story was still set in another parallel world.
Level 4: This model, the difference is the most pronounced. Parallel universes with us have almost nothing in common with us. Not only the conditions of physical constants, but also the laws of physics are completely different.
The geometry of the universes at this level is completely different, whereas our universe today has many closed universes, flat universes, universes with a complex spatiotemporal structure, constantly fluctuating … and even open universes but with other laws of physics, completely alien elementary particles, where we have no chance of surviving if we are pushed into it.
Currently, people are trying to look for additional signs such as radiation irregularities as evidence of the existence of the multiverse (of any level), but with current technology, any measurement of this background radiation is not absolutely accurate. Assuming there is evidence from other universes, it would be impossible to observe it.
