First, a question for everyone:
Do you believe there are aliens?
There is a paradox that since 1609, when Galileo began to observe space, more than 400 years have passed, and these hundreds of years, known as the era of opening and hanging in human history, have emerged countless top figures. Under the foundation of these theories and practices, we discovered the solar system, discovered the Milky Way, discovered the observable universe, but since then, things seem to have become terrible...
This has to be mentioned that the scientific paradox proposed by Fermi in 1950 has left mankind with 9 conjectures that make people ponder, and which of these 9 conjectures is the truth of mankind? First, we have to understand how big the Milky Way really is
<h1 class="pgc-h-arrow-right" data-track="141" > how big the Milky Way is</h1>
This is the size contrast between the Earth and the Sun
However, such a huge sun is only a member of the Milky Way, so how big is the diameter of the Milky Way? Previously, it was known to be 100,000 light-years, but in the past two years, due to advances in observations, the diameter of the Milky Way has been further expanded to 200,000 light-years.
What does two hundred thousand light-years mean? Now that we know that the solar system is two light-years in diameter, and now that we want to expand the diameter by a hundred thousand times, we can see that in the picture, the solar system cannot even be found
Galaxy
<h1 class="pgc-h-arrow-right" data-track="213" > how big the universe is</h1>
The Milky Way is just a small galaxy in the observable universe, with as many as 125 billion galaxies in the observable universe. To give an easy-to-understand example: If the observable universe is the size of this basketball gym, remember to hold your breath. Because with every breath you take, you accidentally suck dozens of Galaxies into your lungs
Yes, in a basketball gym where the observable universe is proportional, the Milky Way is only equivalent to a little dust floating in the air. So, how many alien civilizations in the observable universe are similar to humans? Now, come and count [halo] with me.
<h1 class="pgc-h-arrow-right" data-track="214" > Drake's formula</h1>
We calculate the approximate population of a community, multiply the number of inhabitants of a building by the total number of buildings in the community, and we can come up with a rough population, similarly, the scientists according to the conditions of life. And all the factors related to extraterrestrial life, the final derivation of a formula for calculating the number of alien civilizations, this is the 1960 Drake formula.
公式：N=Rg×Fp×Ne×Fl×Fi×Fc×FL
(where: R represents the number of civilizations in the Milky Way that may communicate with us The number of stars in the Ng Milky Way The proportion of planets in fp stars ne the number of Earth-like planets in each planetary system f l Proportion of habitable planets with living evolution f i The probability of evolving highly intelligent organisms fc the probability that highly intelligent life can communicate fL The proportion of scientific civilization duration in the life cycle of the planets)
Some of you may think it's too complicated, but you don't need to understand ~ you just need to know that this formula deduces a surprising result, there should be about 1 billion planets like Earth in the Milky Way alone, and produce about 100,000 civilizations like ours
Even if only a small part of the external radio, laser beam, or other contact signal is transmitted, we should be able to receive it. However, strange is strange here, we have not received it once, however, this is not the strangest ....
<h1 class="pgc-h-arrow-right" data-track="215" > Karlschoff index</h1>
According to the Karshev Index (a method used to measure the advanced rank of a civilization's technology, proposed by the Soviet astronomer Kardashev in 1964) the development of a civilization has three levels:
We humans are not even the top of the first level at the moment. Reaching the third level civilization, with the ability to travel interstellarly, the time required is about 4 million years, small partners, do not be frightened by this time, the current galaxy age is about 12 billion years
How many 4 million years does this contain, and how many rounds of third-level civilizations can be produced? Logically, they should have discovered the earth a long time ago. But where are they?
The number of civilizations derived from Drake's formula, the development of civilization brought about by the Karshev index, tells us in both space and time that we should find aliens. But we see nothing and hear nothing, and in the empty universe, there is darkness. This contradiction between the overestimate of the existence of extraterrestrial civilizations and the lack of relevant evidence is the Fermi paradox that has been hotly debated since 1951
<h1 class="pgc-h-arrow-right" data-track="216" > Fermi's paradox</h1>
Since the Fermi paradox is contradictory, there are 9 conjectures under the three branches, and some of these 9 consequences are not willing to face by human beings
Under these 9 conjectures, the brain in the vat, the extermination theory, the Great Filter and other ideas do not go away, and the dark forest law in our famous science fiction novel "Three-Body Problem" belongs to the third branch of the Fermi paradox, these conjectures I have made a series of videos, you can click on my avatar to watch Oh.
Here I would like to emphasize one point
It is Robin Hansen's conjecture of the Great Filter
A lot of things develop
Let this idea get more and more people's support
Big Filter conjecture
The Great Filter refers to the fact that any civilization that develops to its peak will face a wall, and the probability of it being able to pass is extremely low, and it is also possible that the entire civilization cannot pass through and be completely erased.
Artificial intelligence, nuclear war, or, the five mass extinctions that have occurred on Earth, we don't know exactly what this wall is, how to prevent it, and there is a more critical question: Where is the Great Filter?
If it is behind human civilization
So congratulations guys, we've crossed it
But if it is ahead of human civilization
Well this means that we will have big trouble anymore ...
This allows us to find alien fossils on Mars
It's going to be a terrible thing...
Due to space limitations, this content, and the 9 conjectures of the Fermi Paradox, I will talk about it in the next issue. What kind of truth do you think humans are more in tune with? Welcome to leave a message below ~ ~ This series, I named it "Brain Hole", has been made into a video and has been completed. Friends can enter my homepage, or click the link below to watch Oh ~
Why are the unseen aliens the most terrifying? The video is 1.25 times more exciting than the article