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Traces of a rocket fuel ingredient found in the Martian soil would not necessarily hinder potential life, US scientists said.
NASA's Phoenix spacecraft recently detected the chemical perchlorate, a highly oxidising salt, in soil samples dug up from near the Martian surface. On Earth, it can be found naturally in the arid Atacama Desert in Chile where some extreme organisms use it as a source of energy.
"We know that microbes can exist quite happily in oxidising conditions," said Phoenix scientist Richard Quinn of the NASA Ames Research Centre. "The story possibly could turn out to be the same for Mars. We don't know yet."