A large-scale structural simulation of the universe. Nico Hamaus / Universitäts-Sternwarte München / The Ohio State University
If we have a God perspective, what does the universe look like? This question is not very good to answer. Because no one has ever seen God, no one knows which scale God exists on.
But if we retreat far enough, as far as the entire Milky Way looks like a point, then the large-scale structure of the universe will appear. At this scale, the universe is like a giant spider web, which we can call a cosmic cobweb.
This cobweb spreads across the universe (at least the known universe), which is both grand and ingenious. It is woven from thousands of galaxies. The main body of the spider web – the spider silk – is a galaxy, a matter; and between the spider silk and the spider silk, it is a vast and innocent space. The scale of these spaces is at least tens of millions to hundreds of millions of light years, and some people call them universe holes. There is almost no substance here. It can be said that most of our universe is nothing but nothing.
But don’t underestimate these voids. Behind these voids, the ultimate mystery of the universe may be hidden.
A long time ago, there was no cobweb in the universe. There are even galaxies and stars in the universe. The universe at that time was filled with hydrogen, helium, a very small amount of lithium, and dark matter. These things are distributed almost evenly throughout the universe. But there is always a difference here . Some places have a higher density, and some places have a lower density. Where the density is high, the gravitation is stronger, and they will attract nearby materials. This has led to an increase in their quality and an increase in gravity.
Slow and long-lasting, after hundreds of millions of years have passed, the rich are rich and the poor are poor. Almost all of the matter is gathered together. In dense places, the material collapses to form stars, the stars form galaxies, and the galaxies form clusters of galaxies. The matter moves toward the place where gravity is concentrated, and their original location is vacant. Cosmic cobwebs have formed and cosmic voids have emerged.
Of course, the universe is not really nothing. There may also be sporadic dwarf galaxies floating there. But overall, it is empty. And because it is empty, there is another mysterious thing, hiding one of the biggest secrets of the universe – dark energy.
Dark energy is a solution used by cosmologists to explain the accelerated expansion of the universe. We don’t know what dark energy is, but we suspect that time and space have some kind of feature that we don’t know yet. It acts as a repulsive force, pushing the space itself to become bigger. Theoretically dark energy exists in all spaces. But it is very weak, and we are not aware of it where it is full of matter and radiation.
But in the empty universe where the opposite is the case. There is almost nothing left, no one can compete with dark energy. It is the home of dark energy. The result of the accelerated expansion of the universe is mainly reflected in these hollows. These hollows will become bigger and bigger, and they will gradually push everything around them, mainly the galaxies, away from each other, and slowly take the gigantic structure that gravitation takes billions of years to build up. -destroy.
So don’t underestimate the void, it may be very powerful, it may also be the key to explaining everything. Although there are few stars and no light there, these dark and empty places guard a big secret in the universe.
Listen to the Void: Why Cosmic Nothingness Has So Much to Say