Where did so much liquid water on Earth come from? After listening to the explanation of the scientists, I suddenly realized

Our earth, in the solar system and even in the universe, is a very special planet. On the earth, the ocean area occupies about two-thirds of the entire earth's surface. It can be said that the name of the earth's Mercury is not for nothing. It is precisely because there are so many water resources on the earth that our human wisdom and civilization can be born.

Moreover, after so many years of human exploration of the solar system, scientists have discovered that among so many planets in the solar system, the earth is the only planet with liquid water on the surface. And the surface of the earth can have liquid water, also because the position of the earth from the sun is just in a suitable position that is not far or near.

If the earth were too close to the sun, the liquid water on the surface would be evaporated. If it is too far away from the sun, the surface will become a frozen planet because the temperature is too low. Just like the moons of Jupiter, Europa, Ganymede, and Ganymede, although there is a lot of water on them, because the temperature is too low, there is only liquid water inside the planet. As for the surface of the planet, it can only be a very thick layer of ice.

Therefore, in such a large solar system, the earth is the only planet with intelligent life. However, it is not the only planet with liquid water. Moreover, it is not the planet with the most water resources. At least, according to the detection of scientists, the water resources on Europa far exceed that of the earth.

Although in the solar system, so many planets have water resources. However, there are also many planets without water resources. This also shows that there are no water resources on the planets in the universe, otherwise there would be no such phenomenon that some planets have water postures and some planets have no traces of water.

However, some friends have to ask, since this is the case, where does so much water on the earth come from?

In this regard, some scientists speculate that so much water on the earth may have been brought over by comets. Because in the solar system, there is the existence of the sun, and the place close to the sun cannot exist liquid water because of the high temperature. In places far from the sun, even if there are water resources, they can only be solid ice, and it is impossible to cross the starry sky to the earth.

According to some scientists' studies, it is speculated that when the earth was born, there was no water resources, and it was just a simple rocky planet. Only later, when an extraterrestrial comet passed by the earth, it was attracted by the huge attraction of the earth, and directly hit the earth.

And, as it happens, these comets all carry a lot of frozen water. After the comet hit the earth, the frozen water carried by the comet scattered on the earth. And because the temperature on the earth is so high, these frozen water will slowly melt, pool together and become the ocean.

As for the question of how many comets are needed to bring so much liquid water to the earth, according to the estimation of scientists, only one comet is needed. And if it is a planet like Europa, the earth will be covered by the ocean immediately, and there will be no land area.

So, where did this comet that brought water resources to the earth come from? Some science speculates that it may come from the Oort Nebula outside the solar system. Because the Oort Nebula is close to the solar system, and there are a large number of small celestial bodies in it.

However, the specific real situation may require further exploration by scientists. However, I don’t know what your friends’ opinions are like?