For thousands of years, humans believed that the Earth was the center of the universe, and that the stars at night and the sun at day revolved around it.
When humans invented telescopes and even went out of the Earth, they finally found that beyond the earth was a much larger space, containing hundreds of billions of stars and countless planets, and the Earth, humans and even the entire solar system were small and not even dust.
Although our current technology does not allow us to reach the vast expanse of interstellar space, space telescopes have given us a glimpse of the larger universe. The Hubble Telescope has been in space for 20 years and has brought us many stunning images.
On this piece of Angle of only 3 points, only one over twelve million of the whole sky images, consists of tens of thousands of galaxies like the Milky Way, the observable universe 930 light-years, but the range is the range of human will observe the universe, according to the big bang theory, the expansion of the universe is accelerating, the expansion rate has reached on the edge of the speed of light 39bet-đua chó-game giải trí -đá gà-đá gà trực tuyến-đánh bài.
So the extent of the universe we know is probably just the tip of the iceberg, and there's a lot more out there than that.
So how big is the real universe?
Does it have a boundary?
If there is a boundary, what is beyond it?
In our ancient book "Corpse son", the universe was described as follows: the universe is about four things, in ancient times and in the present, meaning that the universe is endless and four endless things.
Similarly, Einstein also believed that the universe is the collection of time and space, so from this point of view, only the universe with both time and space is meaningful. Since you want to explore the edge of the universe, you must first find the beginning of the universe, that is, the beginning of time and space.
The prevailing scientific theory holds that the universe was born 13.8 billion years ago in a singularity explosion: in the void, there existed a singularity of infinite density and mass, infinitely high temperature, but infinitely small volume.
From the moment it exploded, space and time were born. Matter existed in the form of electrons and photons at first. After cooling, it gradually formed atoms and molecules, and finally evolved into the universe we see now, which was the beginning of the universe.
The Japanese physicist Michio Kailai once described the state of the singularity before the Big Bang, and he thought that it could be understood as absolute nothing, no time and no matter, such a universe that we can hardly imagine what it would look like.
Having found the beginning, where is the end, the edge?
According to the Big Bang theory, the universe is probably not flat, but has a huge distortion of space-time, just like we can walk in any direction on Earth, but because the Earth is spherical and walks in a straight line on the surface, we can never get out of the Earth, and the same goes for the universe.
Even with our current state of technology and understanding of the universe, talking about the edge of the universe seems like a false proposition.
Because as far as we can see in the universe, the principle of isotropy exists, what is isotropy?
To make sense of it, the universe looks pretty much the same no matter which way we look at it, 93 billion light years across if we look at it from Earth, or 93 billion light years across if we look at it from Mars or even from the center of the Milky Way.
That means there's no center, there's no boundary, but isn't the universe expanding all the time?
Which way is it expanding?
In fact, the expansion of the universe, not in a straight line as the center, like some firecrackers have direction to go forward, it the whole scale of the expansion is more like a not closed the loudspeakers, or like a slowly by inflating a balloon, a balloon on every point in evenly outward expansion, every point is the center, so there is no edge, also does not have the concept of "the universe".
But the Big Bang theory isn't perfect. Perhaps one day it will be overthrown, just as Copernicus overthrew geocentric theory.
Hawking once argued that perhaps our universe is "one of many bubbles". The bubble cosmology theory argues that during the cosmic guarantee phase, many cosmic bubbles were born, some of which stopped expanding and became stationary universes, while others are still expanding, such as the universe we live in.
And we're right at the center of that bubble, so we can watch the universe expand.
Beyond this bubble, there are an infinite number of bubbles, an infinite number of parallel universes, each of which is a separate existence, each with its own specific physical laws.
Except after the big bang theory, a bubble universe also got some recognition, and some scientists have found a trace of the collision, such as wave with its 10-light years jiang seat empty, according to the density of the universe to estimate is normal, this range at the very least, there are billions of galaxies, but actually only 100 galaxies.
Scientists think that our universe may have collided with another universe to create such a large hole.
For mankind, the origin of the universe and the end of the universe are still the ultimate puzzle. We may never find the answer, but we will never stop searching.