
In the words of Michael Meyer, lead scientist for NASA's Mars Exploration Program,
A fundamental question for this mission is whether Mars could have supported a habitable environment. From what we know now, the answer is yes.I'm sure you heard about this, but it's worth mentioning here for a reason beyond the basic coolness factor. Let's be clear: First, Curiosity did not find life on Mars. Second, this doesn't mean there ever was life on Mars.

Is there life anywhere out there? We don't know. But it does seem that every discovery we make - especially in light of the fact that there are now nearly 1000 known planets outside our solar system and NASA's Kepler mission has discovered about 3000 more possible planets to be checked out adn we've barely started looking - it seems that every discovery we make, even as it doesn't prove there is life elsewhere, keeps on increasing the chances for it.
Sources:
http://www.usatoday.com/story/tech/sciencefair/2013/03/12/mars-top-five/1982783/
http://www.dailytech.com/NASA+Curiosity+Rovers+Rock+Sample+Suggests+Life+on+Mars/article30108.htm
http://cosmiclog.nbcnews.com/_news/2013/03/12/17285137-curiosity-rover-sees-life-friendly-conditions-in-ancient-mars-rock?lite
http://science.nasa.gov/science-news/science-at-nasa/2013/12mar_graymars/
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