TAMPA, Fla. — Cowboy Space, founded less than two years ago as Aetherflux to develop space-based solar power, has raised $275 million at a $2 billion valuation to build rockets with upper stages that would serve as data centers once in low Earth orbit (LEO).

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Jason Rainbow writes about satellite telecom, finance and commercial markets for SpaceNews. He has spent more than a decade covering the global space industry as a business journalist. Previously, he was Group Editor-in-Chief for Finance Information Group,...