The process of cooling the Earth from a lava planet to a habitable planet and gradually giving birth to life is the result of natural evolution, but from another point of view, it is very similar to intelligent life actively choosing the Earth, because the planet Earth is really too many coincidences.
Now let's look at the interesting planet Earth from the perspective of intelligent life. When the seeds of intelligent life are looking for their home in the vast universe, a galaxy with an extremely regular distribution comes into view, which is the Milky Way. The central region of the Milky Way is very bright because there is a galaxy-level black hole here, and the black hole's strong gravitational pull attracts a large number of stars around it, which in turn constitutes the center of the Milky Way, that is, the silver core. The silver heart is dazzling, but it is not suitable for intelligent life to stay, because the density of stars here is too high.
A large number of stars gather together, and the gravitational pull between them will form a mutual interference, so the operation of the star often fluctuates, and this fluctuation can have a huge impact on the surrounding planets.
The absence of a stable orbit means that the climate on the planet often changes dramatically, which is an unbearable weight for life, so the seeds of intelligent life decisively abandon here. We have to stay away from the silver heart and look for a safe area, but it is not enough to stay too far away. Life is very complex, even relatively simple life forms require a large number of different elements as a material basis, but the universe was born at the beginning of the production of only hydrogen and a small amount of helium, the rest of the elements need to be produced in the fusion process of stars, and the elements above iron rely on supernova explosions or neutron star collisions to be produced.
If it is too far away from the silver core and the environment is too deserted, then there are not enough elements to synthesize life, so galaxies also have habitable zones.
The Milky Way is a galaxy with a radius of hundreds of thousands of light-years, and its habitable zone width is only about 2 light-years, so there are not many regions to choose from. There are a variety of stars in this 2-light-year wide habitable zone, which one should you choose? Too big doesn't work, because the lifespan of a star is inversely proportional to its mass, and the greater the mass, the more intense the fusion of hydrogen nuclei and the shorter the lifespan, and the lifespan of those big stars is often only a few million years, and the time required from the germination of life to the birth of intelligent life is up to billions of years. So let's choose one that's as small as possible, right? Nor can it.
Smaller stars do have a long lifespan, some of which can last tens of billions of years, such as Proxima Centauri, which is 4.22 light-years away from Earth.
Once upon a time, scientists also suspected the existence of a living planet near Proxima Centauri, but as humans learned more about the universe and stars, they knew that this was impossible. Because small-mass stars, although long-lived, are very unstable, sudden bursts of energy can easily destroy the ecological environment of the planets near it, so it is very dangerous to stay around such a star, and it is necessary to choose a small one. Soon, the seeds of intelligent life set their sights on a yellow dwarf star called the Sun, which was just the right size. When a star is selected, the planet must be chosen, because the planet must be within the star's habitable zone, and the sun's habitable zone is between 0.97 and 1.688 astronomical units from the sun.
Within the Sun's habitable zone there is a blue planet, the Earth, which is the most appropriate, but not perfect, because the planet does not have a suitable inclination between its axis of rotation and its axis of rotation.
Without the right inclination, it means that there are no seasons and a changeable climate, the environment is too single, which is very unfavorable for the evolution of life, on a static planet, spending billions of years, life may still be the first germination. At this point a god of the universe named "Coincidence" seemed to hear our sorrows, and it threw an asteroid called "Theia", which crashed into the Earth at a sharp angle, and the debris that hit it formed a large moon, the moon.
With the gravitational pull of the Moon, the Earth has a suitable inclination, and seasonal changes appear on this planet.
With the change of the four seasons, life flourished on this planet, but there was only a slight deviation, life did not take the road of wisdom, but embarked on the road of strength, and an ultimate evolved form called the dinosaur appeared, which was too powerful to completely suppress the development of other life forms. At this time, the god named "coincidence" came again, it threw an asteroid, this time the impact directly plunged the earth into a long and severe winter, the climate mutation made the dinosaurs completely extinct, after which mammals developed rapidly, after more than 60 million years, intelligent life finally appeared. As intelligent beings, we know that all of this stems from coincidences, but the many coincidences that come together are too much like the active choices of intelligent life.