They LOOK for Life
Do they destroy it too? – Robot landers that were sent to Mars to search for life may actually have destroyed it.
In New Scientist, David Shiga reports that NASA’s Phoenix lander found chemicals called perchlorates in the Martian soil. When heated, these release oxygen and thus cause nearby material to burn (which is why they are used in rocket fuel). The heat from the Mars lander may have heated the perchlorates in the soil and burned away any life forms there before the lander could detect them.
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