One thing about aliens and Earth-type planets
The problem by using statistics for calculating the number of civilizations from the universe is that we know officially one single technically advanced and intelligent civilization. And that civilization is created by Homo Sapiens. The thing is that if we are thinking more carefully about the civilization in the Kardashev scale and our race, we must remember that we are maybe at the level 0,7 or 0,8 in that scale, and that means we are proto civilization. And here we are continuing to think about the form of aliens.
When we are thinking about the form of the aliens, we must remember that there is one thing, what we must realize. The Earth-size planet that is in the habitable zone doesn't mean that the intelligence starts to dominate in some species. And the thing that caused that the form of the intelligence replaced a large number of descendants on the Earth was the meteorite, which destroyed dinosaurs. But the things like ice-ages transformed the culture of humans, that it started to favor technical solutions like houses and weapons.
But the thing is that we know one Earth-size planet, what is a straight copy of Earth, and the distance to that planet is about 3000 light-years, so radio waves are traveling to that planet 3000 years. And then the radio signals must travel back to Earth 3000 years. So if there is some kind of intelligent civilizations we would get an answer that takes 6000 years, and in this hypothesis, aliens would answer immediately, and that thing is far away from the realistic models. They maybe think the while, can they answer, and would the answer serve their benefit.
So what means that the distance to some planet is 3000 light-years? That means that we see that planet, what it looked like 3000 years ago. And what the earth looked like 3000 years ago? If we will send the data transmission to that planet, we would have a good time to wait for an answer, and if there are intelligent aliens, they have time to advance. So this is one thing, what we must remember.
But when we are looking at the alien civilization, we must remember one thing. Those civilizations and species are formed by evolution, what is happened on another planet. So they are creatures, what is fully adapted to their home planet. And at this point, we should stop to think that the human race is the center of the universe. The place that might seem quite uncomfortable for us is a paradise for the creatures, what are formed in that place.
At this point, we must remember that even Earth is not a paradise for humans. In most of the areas of the Earth, we need some kind of clothes to protect us against cold weather. Or can we live at Tundra without clothes? There might be very cold in the winter. So that kind of area requires clothes. When we want to be honest about the aliens and alien civilizations, there are billions of planets, and billions of stars. But we know only one intelligent species.
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Drake Equation
https://en.wikipedia.org/wiki/Drake_equation
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Fermi paradox.
There is a formula, that is used to calculate the probability to find another civilization. That formula is called the "Fermi paradox" causing the thing, which is known as "Drake equation". When an astronomer named Frank Drake introduced his famous formula for calculating possibilities for finding intelligent civilizations, there was only one confirmed solar system.
That solar system has only one Earth-size planet, where was the intelligent life form and that planet was Earth, and the intelligent species is Homo Sapiens. This thing makes this thing the paradox. If we know only one solar system, where is one planet in the habitable zone, and we use that value in the formula.
If we that formula used to calculate the probability to find the intelligent and technically advanced civilization means that Every planet, what orbits the similar star at habitable zone would have the intelligent and technologically advanced aliens. But can we make contact with those aliens? The thing is that those aliens need to build radio telescopes and follow the hydrogen alpha-emission for getting messages from the human race.
Fermi paradox: https://en.wikipedia.org/wiki/Fermi_paradox
Drake Eqaution: https://en.wikipedia.org/wiki/Drake_equation
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