For United Launch Alliance (ULA), deciding how much reusability to build into its new line of Vulcan rockets came down to a question of math: Is it better to get 100% of the rocket value back some of the time, or two-thirds of the value all of the time? The answer, says ULA CEO Tory Bruno, depends on how big satellites will be in the future. Heavier spacecraft generally require more performance from their launchers to reach their intended orbits, possibly to the point of draining fuel ...


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