If there's water, there may be Martian micro-organisms present on the ground.  
Whatever the case may be, it appears that future astronauts would be able to 
live on Mars indefinitely.
 

 

 
http://https://www.yahoo.com/finance/news/scientists-may-found-liquid-water-165000026.html
 
http://https//www.yahoo.com/finance/news/scientists-may-found-liquid-water-165000026.html

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