"Why Did Mars Lose Its Atmosphere? NASA Robotic Mission to Seek Answer"
This is the title of a very interesting article for the DailyGalaxy: http://www.dailygalaxy.com/my_weblog/2009/05/did-mars-lose-i.html

NASA is planing a future mission to Mars in 2014 to answer that question.

There is also another article from BBC about the same subject: http://news.bbc.co.uk/2/hi/science/nature/7618344.stm

What do you think?