There should have been three “earths” in the solar system, but now there is only one left. Why did the other two disappear?

There should have been three “earths” in the solar system, but now there is only one left. Why did the other two disappear?

The earth is the most special of the many stars in the universe. It is known that there is life in the stars and breeds countless lives. Before human beings, there were five mass extinctions on the earth. We can’t know the real reasons for these species’ extinctions. It’s very gratifying that human beings eventually became the masters of the earth. After the improvement of science and technology, human beings began to explore the entire solar system intensely, eager to find alien civilizations besides human beings. The moon, Mars and other stars have been studied, but so far no trace of life has been found.

If we push the time to 4 billion years ago, the earth is not the only one special in the solar system. We should have three earths. We thought that all of them could evolve into life, and only the earth itself is left. This is puzzling. Then what are the other two “earths”? They are Venus and Mars. After years of exploration, human beings have learned a lot about these stars and sent countless probes to them. It can be determined that the environment of these two stars is very bad and far from the earth. There should have been three “earths” in the solar system, but now there is only one left. Why did the other two disappear?

There is not a lot of oxygen in these two stars. For all creatures, oxygen is an indispensable resource. Once they enter the anoxic environment, any creature will suffocate and die. Until it is certain that Mars and Venus have oxygen, it is difficult for them to survive. According to the calculation of solar radiation power, Venus and Mars have been running in the habitable zone, receiving a lot of solar radiation to keep the surface in balance. From the various signs of these two planets, it can be inferred that there is a large amount of liquid water inside them, and there is likely to be a huge ocean.

Venus, in particular, was a warm and humid planet before its early days. Originally, it had a good chance to evolve life. However, such a good condition does not last long. It is too close to the sun. As the temperature of the sun rises, Venus will become hotter and the liquid water will evaporate. As time goes by, water resources will become increasingly scarce. What’s more, there are frequent volcanic activities on Venus, releasing a lot of carbon dioxide, which will cause serious greenhouse effect and cause a serious disaster Out of control, even if there has been life, it will go extinct because of the great changes in the environment.

Once upon a time, many people pinned all their hopes on Mars, which was supposed to be a habitable planet because it was found to be full of water resources. In 3.9 billion years, a dwarf planet with a diameter of about 2000 km collided with the north pole of Mars, which changed the face of Mars. While the magnetic field weakened, the liquid water evaporated and soon became barren. In addition, there was no atmosphere on Mars, which completely restricted the survival of life.

Compared with Venus and Mars, the earth is the luckiest. In the past decades, the earth’s environment has been stable. Although there have been many species migrations, many creatures are still tenaciously living in the earth, because the earth has a very suitable environment for life to multiply here. We should thank the earth for everything. In the foreseeable future, the earth will be the only home that can survive. What do you think of this? You can leave a message for interaction.

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