NASA spent $1.4 billion of its $1.8 billion SLS budget for 2013 on vehicle development, down from the $1.5 billion it spent in 2012.

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Dan Leone is the NASA reporter for SpaceNews, where he also covers other civilian-run U.S. government space programs and a growing number of entrepreneurial space companies. He joined SpaceNews in 2011.Dan earned a bachelor's degree in public communications...