When NASA and SpaceX announced they had modif ied an existing agreement that involves the company’s “Red Dragon” Mars lander concept, it was, unsurprisingly, SpaceX that got all the attention. But what’s in it for NASA?

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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...