Bridenstine and Loverro
NASA Administrator Jim Bridenstine (left) and Doug Loverro, the associate administrator for human exploration and operations, said they would not let funding issues be an excuse for not achieving the goal of returning humans to the moon.

Doug Loverro, the NASA official responsible for human spaceflight programs, left the agency May 18 after less than six months on the job.

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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...