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I'm writing a story based on the premise that an already-existing moon base is used to mine, construct, and launch a bunch of commercial satellites to GTO (the lunar surface is way "closer" to GTO than Earth's surface, in terms of delta-v, making launches vastly cheaper).

My question is, specifically, which metals/materials make up a commercial satellite, and in roughly what proportions? From there, I can determine what can be mined from the moon, and what must be imported from Earth (at insane expense).

Thanks!

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    $\begingroup$ Aluminum and silicon (plus impurities)... $\endgroup$ – Organic Marble Apr 5 '18 at 12:00
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    $\begingroup$ Magnesium and titanium may be used too. But pure metals are often less strong than a carefully chosen alloy of several metals, for instance alloys like duralumin used for airframes and spaceships. $\endgroup$ – Uwe Apr 5 '18 at 14:25

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