NASA will now foot the entire bill for the United States' production of plutonium-238 spacecraft fuel, which recently started up again for the first time in a quarter-century.
The space agency had been splitting costs for the reboot with the U.S. Department of Energy, which actually produces plutonium-238. But NASA is the only projected user of the stuff, so the arrangement changed in the White House's federal budget request for 2014, which was unveiled earlier this month.
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