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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 2007 WD5 is a 50 m diameter Apollo class near-Earth object and a Mars-crosser asteroid discovered on November 20, 2007, by Andrea Boattini of the Catalina Sky Survey. Early observations of 2007 WD5 caused excitement amongst the scientific community when it was estimated as having as high as a 1 in 25 chance of colliding with Mars on January 30, 2008. However, by January 9, 2008, additional observations allowed NASA's Near Earth Object Program to reduce the uncertainty region resulting in only a 1-in-10,000 chance of impact.