SpaceX postponed the Jan. 6 launch of a Falcon 9 rocket because of a technical problem with the vehicle’s upper stage, delaying the delivery of supplies to the international space station and a demonstration of the potential reusability of the rocket’s lower stage.

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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...