From left: Human lander concepts from Blue Origin, SpaceX and Dynetics.

Blue Origin, SpaceX and Dynetics have NASA’s trust, but not a lot of time, to meet a 2024 goal for landing on 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...