We all know that the earth is a beautiful blue planet, the earth’s ocean area accounts for 71% of the global area, and only 29% of the land for human survival. For life on earth, water is the source of life. Without water, there will be no birth of life on earth, no birth of human beings.
As a result, many people have a question: where did the water come from in the early stage of the earth’s formation? Is it the earth itself or from space? Many people may think that there are not many water filled planets like the earth in the universe. In fact, this is not the case at all. With the continuous progress of human science and technology, out of the earth began to explore the universe.
Through exploration, scientists have found that water is not a scarce thing in the universe, but a universal one. For example, in our solar system, there are many planets with water. Of course, if we want to have liquid water on the surface of a planet, we must be in the habitable zone, because if we are too close to or too high from the sun, the temperature will be too high or too low, and there will be no liquid water on the surface of the planet.
In addition to liquid water on the surface of the earth, there are no other planets in the solar system. However, there are a lot of frozen water on the surface of many planets, such as Jupiter’s moons, Europa, Ganymede, and Titan, as well as Saturn’s moons. Uranus and Neptune also have a lot of ice crystals.
This shows that the solar system is a galaxy full of water, so where does the water of so many planets come from? In fact, water on the surface of a planet, whether solid or liquid, comes from two sources: one is the slow birth of the planet itself, and the other is the impact of comets. So how does water come from the earth?
If the water on the planet wants to be born by itself, there is an essential condition, that is, it is far away from the star. If it is close to the star, because the strong radiation and temperature of the star do not allow the existence of surrounding water molecules, naturally they can not condense into water and fall to the surface of the planet. Only far away from the star, the influence of solar radiation is small, the free water molecules in space will condense into water and land on the planet to become ice crystals.
Because the earth is in the habitable zone and is relatively close to the sun, it is difficult for free water molecules to exist in space at this position, so the earth can not be born with water. The water of the earth can only come from the impact of comets. When the solar system was just formed, it was a chaotic galaxy, and the earth and other planets were just born.
At this time, many celestial bodies come from the interstellar space outside the solar system, including many comets. These comets carry a large number of ice crystals, and in the process of continuous flight, they will continue to absorb and condense ice crystals. When they enter the interior of the solar system and hit the earth, these ice crystals will stay on the earth. Due to the high temperature of the earth, these ice crystals begin to melt and become liquid water.
Because the earth has a thick atmosphere, after comets enter the atmosphere, a large number of ice crystals begin to melt and decompose into the atmosphere, so that the atmosphere has moisture, and then fall to the ground in the form of rain. In this way, comets brought a lot of water to the earth, forming the present ocean. With a lot of water, the earth slowly began to breed life and become a living planet.
In fact, these comets not only bring a lot of water to the earth, but also bring a lot of water to other planets as long as they are hit by comets, such as Mars. Scientists believe that Mars was not as desolate as it is now. Because Mars is also in the habitable zone, a large number of early comets entered the solar system and hit the earth, as well as Mars.
After the comet hits Mars, it will also bring a lot of water to Mars and melt into liquid water to form the ocean. So why is the earth still so beautiful and civilized, while Mars has become a desert? This is mainly because Mars does not have a strong magnetic field and a thick atmosphere. Because Mars has no magnetic field, it can not effectively bind the atmosphere and block the invasion of solar wind.
In this way, although Mars had oceans in its early days, it was also a beautiful planet. However, with the decrease of Martian atmosphere, the invasion of solar wind breaks down the water on the surface of Mars and turns it into space. Slowly, there is no liquid water on the surface of Mars and it becomes a desolate planet.
As we all know, several moons of Jupiter also have a lot of water, especially Ganymede, which has more water than the earth. How does the water come from these moons? Scientists speculate that several of Jupiter’s moons with a lot of water are actually comets that entered the solar system in the early days. They carry a lot of ice crystals into the solar system. When they pass through Jupiter, they are captured by Jupiter’s strong gravity and finally become moons.
So where did these early comets come from? Many people may think of the Kuiper belt on the edge of the solar system. In fact, it is not like this. The Kuiper belt was not formed in the early solar system, and these comets probably came from the Oort Nebula in the outer solar system. Maybe some people don’t understand the Oort nebula.
The Oort nebula is actually equivalent to a star cluster with a diameter range of 2 light-years. Our solar system is actually a galaxy in the Oort nebula, which is very common in the universe. The Oort Nebula formed much earlier than the solar system, which surrounds it. We know very little about the Oort nebula, but one thing is for sure: there are countless celestial bodies in the cloud, including a large number of comets.
The early comets that invaded the solar system came from the Oort nebula. They brought water to the solar system and to the earth. It is possible that the source of life on earth also comes from comets. If you want to fully explore the Oort nebula, you can’t do it with the current human science and technology. Only when the speed of the future human spaceship can make a huge breakthrough and achieve sub light speed flight, can you go deep into the Oort nebula. At that time, you may learn about the origin of the solar system and uncover the mystery of the origin of life on earth.
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