Crew-8 briefing
NASA astronauts (from left) Matthew Dominick, Michael Barratt and Jeanette Epps speak at a Nov. 8 briefing about their Crew-8 mission.

The three NASA astronauts who returned to Earth on the Crew-8 mission declined to discuss the medical issue that prompted a trip to the hospital after their return and, for one of them, an overnight stay.

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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...