SpaceX first had a 12-meter-diameter Interplanetary Transport System plan in 2016. It was only planned for Mars travel and other interplanetary uses. In 2017, SpaceX designed a smaller 9-meter-diameter "Big Falcon Rocket" to replace all of SpaceX launch capabilities— Earth-orbit, lunar-orbit, interplanetary missions, and potentially, even earth transit—but do so on a fully reusable set of vehicles with a lower cost structure. Many of the components on Starship are made of 301 stainless steel.
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