While a dozen space agencies, including NASA, have agreed upon a Global Exploration Roadmap that lays out general plans for human missions leading up to Mars, an April 10 workshop revealed continued disagreement on the best way to get there, particularly regarding the role of human missions to the surface of the Moon.

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Jeff Foust has more than a decade of experience writing about space policy, entrepreneurial ventures and regulatory affairs. In 2001, he established spacetoday.net to aggregate and summarize the day's space-related news stories. In 2003, he started The...