The launch of the first of a new series of polar-orbiting weather satellites, on the next-to-last flight of a venerable rocket, has been delayed several days in order to replace a battery in the rocket.

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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...