Why are humans afraid to bring Martian soil back to Earth?

After human beings entered space, the first thing they explored was the moon. Fifty years ago, Apollo manned the moon many times and brought back soil and rocks from the moon. So someone raised a question: we can bring back soil from the moon for research, but why not bring back soil and rocks from Mars for research?

This problem bothers some people. With the current technology of human beings, it is still difficult to send people to Mars, but it should be no problem to bring some soil back from Mars. So why not do it? You will understand this problem after we listen to the expert's explanation. Experts say that the reason why humans don't bring Martian soil back to earth is actually for the sake of human safety.

Mars is the planet with the closest ecological environment to the earth in the solar system. Scientists found traces of water on Mars. This year, the probe found a salt lake on Mars. These findings make scientists suspect that there may be primitive life on Mars, such as unknown bacteria and unknown microorganisms. Life born in different planetary environments is bound to be different, as are bacteria and microorganisms. They may be normal life on Mars, but if they arrive on Earth, they may mutate and threaten the survival of life on Earth. Think about the scene in the movie Resident Evil.

Scientists are afraid to bring Martian soil back to earth. Another important reason is that American scientists have found a meteorite from Mars in Antarctica before. Of course, this meteorite was not brought back artificially, but was hit back to Earth by an asteroid 6.5438+0.6 million years ago. Scientists found traces of bacteria on this meteorite. It is for the safety of human life that we are very cautious about Martian soil. We can only study in outer space or on Mars, and we are absolutely not allowed to bring anything on Mars to the earth until we are sure that life on Mars may be harmless to the earth. This may also be the reason why humans are very cautious about manned landing on Mars.