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I liked the idea that any space elevator might be built elsewhere, such as mars. The lower gravity makes it less impossible, the lower population reduces the impact of catastrophe, and you are more likely to have space based trading and supply once you’re outside earths gravity
Very interesting idea! I never thought about a space elevator on a moon, like say Titan.
The length of the tether depends on the planet or moon’s gravity and how fast it rotates. Lower gravity and faster rotation make for a shorter tether. A Mars one would only have to be about 3/4 as long as on Earth. Unfortunately, a space elevator tether on any planet or major moon in the solar system would be tens of thousands of kilometers long - all on the same scale of difficulty in terms of materials science.
One of my assumptions is getting off earth will always be the most expensive part of any space activity. Implications are
Therefore even relatively small permanent presences in space might quickly turn to “trade”. If we can refine mineral X on the moon it may be cheaper to ship to a Europa base than for Europa to find it locally, and both be far cheaper than bringing it up from earth