A radiator on the Russian segment of the International Space Station started leaking coolant Oct. 9, the third such incident involving Russian hardware at the station in less than a year.

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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...