Curiouser ana cunouser

摘要

Mars has received its fair share of visitors over the years, each one arriving with ever more sophisticated instruments and promising to uncover ever more of the Red Planet's secrets. Right now, spacecraft are circling it and rovers are trundling across its surface - the most recent being NASA's Curiosity. Yet, when it comes to the question of Mars's ancient climate, they only seem to be muddying the waters.