The spacefaring nations of the world plan to send at least five robotic missions to Mars in the next five years, and eventually begin colonization of the red planet, but the alien life already there may complicate matters.
NASA is worried about infecting Mars with microbes from Earth that hitch a ride on visiting spacecraft and manage to live through the vacuum of space.
That’s why the space agency has hired a planetary protection officer to make sure NASA astronauts don’t accidentally kill off alien life on Mars.
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Coburn Palmer 