The Martian surface may contain a toxic compound called magnesium perchlorate, which destroys bacteria under ultraviolet light, according to a new study  In the laboratory, the researchers exposed Bacillus subtilis to short-wave ultraviolet radiation in a condition similar to that on the Martian surface  They found that in this case, magnesium perchlorate is highly bactericidal, making Bacillus subtilis lose its viability in just a few minutes
Magnesium perchlorate has a stimulating effect on the skin, mucosa and upper respiratory tract of organisms, which is harmful to health
 The researchers believe that this shows that Mars is not suitable for life