A billion years ago, there were three “earths” in the solar system. Why is there only one left now? What about the others?

The earth is the best planet for the formation of life, so people generally believe that as long as other planets have similar earth environment, there is a great possibility of life.

There is a saying on the Internet that more than a billion years ago, there were three planets suitable for life in the solar system. So why is there only one earth left to live?


To this end, scientists have done a computer simulation program, simulation data show that the solar system once appeared three “Earth”.

After the big bang in the solar system, there were three “earths”, two of which are now Mars and Venus.

According to scientists’ research, life existed on Mars, Venus and the earth a billion years ago. It’s just that something happened behind Mars and Venus that makes it what it is today.


Venus a billion years ago

One billion years ago, the environment of Venus was similar to that of the earth. It was located in the suitable zone, with sunshine, water, thick atmosphere, green vegetation and other conditions suitable for life.


Early Venus, like earth, produced a lot of carbon dioxide because of volcanic eruptions.

Venus has no liquid ocean like the one on earth, so the carbon dioxide produced by Venus can’t be absorbed and converted into oxygen.

As a result, the concentration is getting higher and higher. Finally, because of the severe “greenhouse effect”, there is no life, and it has become a hell like now.


Why is it called “hell”? Because today’s Venus surface temperature as high as 500 degrees Celsius, atmospheric pressure as much as 90 times the earth, and from time to time there will be acid rain, this is how terrible!

Mars a billion years ago


We are familiar with Mars. After all, scientists have explored Mars many times in the past half century.

Mars is also considered to be the most similar planet to the earth. The surface temperature of Mars is about minus 23 degrees Celsius. Although it is still very cold, it is the closest to the earth’s temperature compared with other planets.

Scientists believe that a billion years ago Mars also had green vegetation, rivers, lakes and seas, because until now, ice can still be found on Mars.


But later, because of the cooling of the Martian core, the Martian magnetic field disappeared, and the atmosphere was easily affected by solar storms. After a long period of destruction, the atmosphere gradually disappeared, and finally the ocean disappeared, and life could not survive.

Now the Martian surface is like the earth’s desert, often blowing dust storms, and this dust storm is very fierce, lasting for weeks or months. And it’s often large enough to cover the entire planet.


Although there is an atmosphere, it is very thin, only about 1% of the earth’s, and there is almost no oxygen, and the temperature is very low. At the lowest, it will reach minus 120 degrees centigrade. Therefore, it is impossible for organisms to survive in this environment.

After a billion years of change, only the earth has finally strengthened. Because of its strong atmosphere and strong magnetic field, the earth can maintain its dynamic appearance.

Xiaobian thinks that human beings are very lucky to survive on the only planet left in the solar system that is suitable for life, so we should take good care of the earth on which human beings live.


Although there are many planets in the solar system at present, the current technology of human beings is still very limited and cannot be explored in depth.

Maybe there is a planet in the universe that is similar to the earth’s environment and suitable for human habitation, but only through our continuous exploration can we have the hope of finding it.


What do you think of this? Welcome to comment area.

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