Mars Express has detected ammonia in the Martian atmosphere. This is significant because ammonia has a life-expectancy of only a few hours; for it to be present in the quantities detected, it must be being constantly replenished.
There are two projected means of replenishment: active volcanism, or life. So far none of the probes orbiting Mars have seen active volcanic hotspots (though detecting them would be a fantastic discovery). So does this mean there's life on Mars...?
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