Do Martians exist?
Editor’s note: This article is from the WeChat public account “Bring Science Home” (ID: steamforkids), author: Shen mengxi.
Imagine the Chinese Mars Rover/Xinhua News Agency
This year is considered a climax year for Mars exploration. On July 20, the UAE’s Mars rover “Hope” was successfully launched, and China’s Mars rover “Tianwen No. 1” also successfully lifted off, a little later 7 On the 30th, the United States will also launch a Mars rover.
Following these Mars probes to the sky may be our curiosity: Is there life on Mars?
Here, my answer is: I will not be surprised at the emergence of life on Mars. I even think that the emergence of life on Mars is a high probability event.
1. The origin of life on earth
Before talking about life on Mars, we need to review the birth conditions and birth process of life on Earth. According to the current mainstream scientific theory, the earth was formed about 4.55 billion years ago. At that time, the sun was just born from a cluster of nebula. 99% of the matter in the nebula gathered in the center of the nebula to form the sun, while the rest of the nebula matter was surrounding The major planets in the solar system are gradually formed during the movement of the sun [1].
In modern theory, the solar system is formed in a cluster of nebula images/networks
The earth just formed is a hot magma ball, and then the earth cools rapidly. During the cooling process, chemical reactions occur in the magma, releasing a variety of gases, including a large amount of water vapor. After the magma on the surface consolidates to form rocks, the water vapor falls in the form of rainfall to low-lying places on the surface, which is the earliest ocean.
Early Ocean Imagination Picture/EGU Blog
As for when the earliest ocean appeared, scientists have not yet concluded. There is some evidence that the ocean may have existed 4.4 billion years ago, but because about 4 to 3.9 billion years ago, the solar system experienced a It was a late heavy bombing event. In this heavy bombing, countless asteroids hit the earth. The surfaces of the moon, Mars and other planets we see today are densely packed with craters, and a large part of it is due to this. The late heavy bombing event wiped out the evidence of the ancient ocean and the possible existence of ancient life, and it is difficult for us to study now [2].
A map of the earth in the heavy bombing event/NASA
Most of the craters on the surface of the moon are from heavy bombing events/Britannica
