A SpaceX Falcon 9 rocket fitted with a previously used first stage on March 30 successfully placed the 5,281.7-kilogram SES-10 telecommunications satellite into geostationary transfer orbit. Can the company translate reusability into significantly lower launch costs? Credit: SpaceX

PARIS — SpaceX’s Elon Musk on March 30 outlined how his company expects to leverage its latest operational success in reusing a Falcon 9 first stage — and for a commercial payload to geostationary-transfer orbit to boot — into much lower launch costs.

Addressing the issue with perhaps more realism than ever before in public — SpaceX has learned . . .

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