A SpaceX Crew Dragon capsule with four astronauts lifts off atop a Falcon 9 rocket Nov. 15 on the first commercial crew missions to the International Space Station.

The second operational SpaceX commercial crew mission to the International Space Station will now launch in mid-April, carrying astronauts from Europe, Japan and the United States.

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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...