PARIS — European governments are being asked to invest an additional 240 million euros ($295 million) in the Ariane 6 rocket’s development to encourage its industrial contractors to deliver the vehicle ahead of schedule and to cover future program risks, European government officials said.

This sum was not foreseen when European Space Agency (ESA) government ministers approved Ariane 6 in 2014, and ESA governments did not sign off on the spending at a recent meeting of ESA’s ruling council in mid-March.

It is now considered likely to . . .

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