Scientists are hailing the discovery of a fist-sized meteorite from Mars, as a way to possibly unlock vital clues about the evolution of the planet.
Nasa says the rock, nicknamed Black Beauty, could tell them how Mars changed from the warm and wet place it once was to its current cold and dry state.
Discovered in Morocco's Sahara Desert in 2011, the 320g (11oz) space rock contains 10 times more water than other Martian meteorites and could be the first to have originated on the planet's surface or crust.
http://news.sky.com/story/1033365/mars-meteorite-is-water-rich-black-beauty 
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