Mars: its surface is not suitable for life
The surface of Mars is made up of rocks where the winds sweep the floors raising large amounts of dust. In addition, the temperatures are very cold, since they are around -60°C in mid-latitudes. The constant exposure of the surface to various radiations further limits the probability of observing any form of life.
A team of researchers led by Michael Daley (USUHS of Maryland, USA) wanted to see precisely what are the limits of living beings in front of this ionizing radiation. For this, they selected half a dozen microorganisms (microbes), in addition to mushrooms, which still continue to live in places that do not support the life of the vast majority of organisms. As they are resistant to extreme heat and radiationamong others.
Once they made their choice, the scientists decided to perform measurements to quantify antioxidants manganese inside the cells of these microorganisms. These molecules are present when the cells were exposed to the radiation. So if the researchers find a significant amount of antioxidants of manganese in the cells, that will indicate a strong radiation resistance.
Conan, the resistant bacteria
The bacteria Conan (Deinococcus radiodurans) It is the most resistant to ionizing radiation, UV and extreme temperatures. His stamina is so great that he can absorb more than 28,000 times the lethal dose of radiation for humans. It should be noted that the information allows researchers to know the time of life of Conan on Mars.
The latest studies indicate that this bacterium can live within 10 meters from the surface of Mars and could also last a few 280 million years. On the other hand, if Conan is at a depth of 10 centimeters, the resistance is reduced to 1.5 million years. And finally, on the surface, this duration is reduced to a few few hours.