In order for people to appear on Earth, many different events should have occurred. Our planet was supposed to be at the right distance from the sun, and first living cells, animals and primates should have appeared. Given the many necessary prerequisites for our appearance, it may seem accidental that we generally exist. For decades, a model of " It suggests that, given how much time it took people for evolution, our appearance was extremely unlikely. According to this model, the evolution of any intelligent life similar to human would be unlikely on any planet in the universe. But the new theory changes this idea. Reasonable life in fact on any planet can be a much more common phenomenon than expected. The study is published in Science Advances, Popular Science writes.

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Scientists have presented an alternative way to understand why our species required billions of years to evolution. If we died out, some other form of a reasonable life could easily arise instead of us, according to the new theory. At the same time, probably humanity is not the only reasonable look in the universe. The authors of the study believe that people are not an evolutionary accident, but are a predictable result of the evolution of our planet, like any other reasonable life.

The first version of the model with complex steps was proposed by physicist Brandon Carter in 1983. He examined the general predictable life expectancy of the Sun and noted that people appeared on Earth in the second half, when only a few billion years of sunlight and suitability for life were left. The scientist interpreted this in such a way that the average time for the development of human life on any this planet is much greater than the suit of suitability for the life of most planets. And the reason why people took so much time to appear is that a certain number of extremely unlikely biological “complex steps” should have occurred sequentially so that it became possible.

The authors of the study focused on five " According to the model of "

The new theory gives alternative explanations of why each of these events seems rare, discovering the possibility that in fact they are not in essence unlikely. Scientists describe a reasonable life as a result of planetary feedback loops between the geology and the biology of the Earth, where one change makes the following likely or even inevitable. The evolution of life occurs in tandem with the evolution of our planet, scientists say.

Simply put, people were able to evolve as soon as the Earth's biosphere did it possible. And some extraterrestrial biospheres could evolve even faster than the Earth.

Scientists believe that many events in the history of the Earth, which allowed a person, did not occur one, but several times.

According to scientists, any specific biological change can also change the environment in such a way that it will not allow such changes to occur again. The probability of one evolutionary event is not independent of others, according to the new theory.

The idea that life on Earth has formed the Earth itself is key to the new theory. Reasonable life required billions of years to develop, because the windows in which each necessary step was possible were much smaller than Carter expected, and appeared only much later in the history of the earth.

Animals, could not appear before the Earth turned 2 billion years, when the first oxygen appeared in the atmosphere, and people could not appear earlier than about 400 million years ago. Over the most part of the history of the Earth, our planet was not suitable for people's lives, scientists believe.

Our appearance was not necessarily a happy chance. Instead, it became the result of inevitable events, each of which made the following more likely.

Scientists say that it is necessary to conduct a lot of scientific research before anyone can say with confidence how rare a reasonable life is in the universe. But this theory proposes a method of researching planets outside the solar system, which could indicate the existence of extraterrestrial life.

Although the new theory is not a direct evidence of the existence of aliens, it offers a way to verify where, when, when and whether aliens can exist.

Focus has already written that scientists found out at what distance from the Earth there should exist potential aliens so that they could see the presence of a reasonable civilization on our planet.

Focus also wrote that an ultra -massive black hole would face our galaxy, which is slowly approaching us. This huge black hole, scientists believe, exists in a neighboring galaxy and crashes into the Milky Way with it.