It became clear that the harsh conditions on Mars, first all, it is extremely thin atmosphere makes it impossible to exist on the planet advanced forms of life. In the first images sent from Mars by spacecraft, appeared before the people lifeless desert. Nevertheless, left open the possibility that Mars may be simple life forms like bacteria on Earth and other microorganisms. Some of them might well exist in such conditions. Goal Search the simplest organisms on Mars, was delivered in the course of several unmanned missions.
Unfortunately, none of the experiments not yet completed a positive result. Life on Mars has not been found. But can not state that it is not there? Many scientists doubt it. The fact is that in the distant past conditions on Mars were more favorable. Mars was a more dense atmofera, and on the surface could liquid water to exist. Evidence of this - nullah Martian rivers. This means that life could arise entirely on Mars at that time, and not only have arisen, but remain to this day in certain places. So question of finding life on Mars is not yet closed, and he apparently will be placed again before the participants first manned missions to the planet that are planned in the coming decades.

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