After weeks of teasing renderings and production photos, Elon Musk finally showed off the finished Starship test rocket last night.

As you can well see, the Starship test rocket has a stainless steel skin, which had a few people scratching their heads. Steel is indeed quite durable, but weighs more than other materials used in rockets, like carbon fiber, aluminum and titanium. Musk argues, however, that stainless steel’s resistance to extreme temperature, especially heat, makes it

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