NASA is headed baack to Mars with MAVEN, the Mars Atmosphere and Volatile Evolution Mission. In a nutshell, MAVEN will place a satellite in elliptical orbit around the planet. That data will be used to determine the role that the loss of volatile compounds (carbon dioxide, nitrogen dioxide, water) has played through time. Essentially, a look at the history of the Mars atmosphere and climate, which should give insight into the possibilities of habitability. To put it even simpler, we know there was water on Mars, where did it go? If you are curious to know more about the mission, The Verge has a great write-up on it.
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