PARIS — Launch-service brokerage and integration provider TriSept Corp. booked a full mission with startup U.K. smallsat launch provider Orbex in the belief that less-expensive ride-shares on larger rockets from SpaceX, Arianespace, India’s ISRO and Russia’s GK Launch Services will not render small rockets unviable on the commercial market.

That’s the thesis that has propelled New Space investment in dozens of launch startups in the past couple of years to capture the growing government, academic and commercial . . .

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