Mars hit by space rocks 200 times a year
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Small space rocks are carving fresh craters into the Martian surface more often than previously thought, researchers say. A new study finds that there are more than 200 asteroid impacts on the Red Planet every year. These asteroids and comet ...http://science.nbcnews.com/_news/2013/05/24/18475619-mars-hit-by-space-rocks-200...







