Life once existed on Mars?

The earth is one of the eight planets in the solar system and the only living planet in the solar system. As an intelligent life in the solar system, human beings have always wanted to explore other intelligent life in the universe. Although mankind has not made any breakthrough discoveries, it has not given up the exploration of intelligent life.

Mars was once the main exploration target of scientists, because scientists thought that there was a great possibility of life on Mars, because Mars was the planet in the solar system that was most similar to the earth's environment. It is a terrestrial planet like the earth, with four different seasons. The rotation period and inclination of Mars are very similar to those of the Earth.

Because Mars and the Earth have so many similarities, Mars was once called the "sister star" of the Earth. So is there really life on Mars? What is the possibility that Mars is livable? We know that the most important condition for a planet to breed life is to have water resources, but Mars is a desert planet with harsh surface environment and drought and water shortage, so it seems impossible for Mars to breed life.

However, according to the findings of scientists, scientists say that the environment of ancient Mars was as mild as that of the earth, and there was life on Mars. Scientists can come to this conclusion mainly because they have found important clues.

There is a lot of carbon dioxide on Mars, but in the North Pole of Mars, there is a lot of solid carbon dioxide, which is formed by alternating ice layers and changing carbon dioxide layers. When summer comes, the temperature rises and carbon dioxide is completely sublimated, leaving a residual ice water layer, which indicates that there is probably water under the surface of Mars.

Later, according to the images taken by Mars Reconnaissance Orbiter (MRO), scientists determined a huge alluvial delta where rivers poured into a huge ocean, covering almost 1/3 of the surface of Mars. Some researchers say that this phenomenon shows that it provides evidence for the warmer and wetter climate of Mars in the past.

The environment of ancient Mars was probably not as bad as it is now. At that time, Mars should have enough water to give birth to life. Mike Rambo, assistant professor of geology at California Institute of Technology, said: "The ancient environment of Mars and the sedimentary records produced in these environments are very similar to those of the Earth."

In 2008, NASA scientists announced that the Phoenix Mars probe had discovered the generation of water vapor when heating soil samples on Mars. In 20 13, American Curiosity found reliable evidence of water-bearing minerals in Martian rocks. It is reported that Martian rock samples contain phosphorus, nitrogen, hydrogen, oxygen and carbon, which are the key chemical components supporting the existence of life, so this means that the environmental conditions of Mars in ancient times were suitable for microbial survival.

20 15 scientists say that the surface of Mars is very wet, and the water content exceeds that of the Arctic Ocean. 20 18 AFP reported that the first liquid water lake was discovered on Mars. In addition, Curiosity also discovered a fresh water lake that had already dried up, and found key life elements such as carbon, hydrogen, oxygen, sulfur and nitrogen. All these signs indicate that life is likely to exist on Mars.

According to this evidence, some scientists say that the climate of Mars is similar to that of the earth 4 billion years ago, with rivers, lakes and even oceans and life, but unknown reasons have made Mars look like this.

Previously, "Mars Exploration Orbiter" and "Opportunity" Mars discovered that there is water on the surface of Mars, and there may be groundwater on Mars, so it seems that the livability of Mars is still great. Humans have also put forward plans to immigrate to Mars. Maybe in the future, humans can really immigrate to Mars. I wonder if you didn't think of it.

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