While NASA and the Department of Energy have restarted production of a plutonium isotope used to power some space missions, a new report warns of challenges that could threaten its long-term supply.

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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...