When he met with his executive team in the conference room at SpaceX a few days later, they argued that a rocket of stainless steel would likely be heavier than one built of carbon fiber or the aluminum-lithium alloy used for the Falcon 9. Musk’s instincts said otherwise. “Run the numbers,” he told the team. “Run the numbers.” When they did so, they determined that steel could, in fact, turn out to be lighter in the conditions that Starship would face. At very cold temperatures, the strength of stainless steel increases by 50 percent, which meant it would be stronger when holding the
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