From 1975 to 20 19, do scientists know whether there is life on Mars? What progress has been made?

Scientists need to confirm whether there is danger on the surface of Mars, whether there has ever been life on Mars, how to find evidence of their existence now, and constantly collect important clues. In order to better simulate the environment on the surface of Mars and build a perfect Mars living cabin, scientists conducted fixed-point sampling and simulation in the Akatama Desert. As a result, they unexpectedly found that the contents of bacteria and microorganisms here were far richer than we thought, so they speculated that life on Mars had not disappeared, and a small number of microorganisms still survived tenaciously. At the same time, scientists also found that strong winds often blow in Ma Desert in Akata, which will spread the virus in the sample area to other places. This has been confirmed, but some researchers still believe that microbes on the surface of Mars may be scattered to other areas under the action of wind, which is one of the important reasons why humans can't find them. In other words, Mars once had the conditions to give birth to life, and it is very likely that it had early life, but the drastically changed environment may cause them to disappear. And now many scientists think that strong wind may be an important reason for the continuous migration of microorganisms. In addition, scientists say that microorganisms, as life, can withstand the test of high temperature, high radiation and strong ultraviolet rays. In the thin atmosphere of Mars, the wind can take it to more places, and even if it can't stay, it may get more living resources for it. The above phenomena, like ocean currents, can not rule out the possibility that microorganisms can survive in the atmosphere, so we can only make a comprehensive study of them with the help of advanced technology. In short, whether there is life on Mars is still unknown, and human beings need to rule out more possibilities in order to provide more information for future Martian immigrants. Once humans begin to live on the surface of Mars, a certain microorganism may be a deadly threat. What's more, microbes in the atmosphere will change their positions with the wind blowing, and it is not easy for us to find their traces. Scientists can sum up more experience through the related research of Akata Ma Desert. 2065438+On June 7th, 2008, the American rover Curious found new evidence in the rocks and atmosphere of Mars, indicating that this red planet may have once had life, and may even still have life now. The researchers published two papers in the new issue of the American journal Science. The first paper said that Curiosity had found organic matter in the Gaelic Crater on Mars. There are rocks formed by silt deposited at the bottom of ancient lakes 3 billion years ago. Curiosity drilled rock samples and found thiophene, benzene, toluene and other organic substances. Researchers believe that there may be creatures in the lakes on ancient Mars, and these creatures may be left behind by them. Another paper introduces the seasonal fluctuation of methane level in Gael crater, which is the first time to find the periodic change of methane level on Mars. The researchers pointed out that the possibility that these methane come from biological activities cannot be ruled out at this stage.