A cable connecting a point on the surface of a planet to a point directly overhead in synchronous orbit. Simple, really.
The point is that you can haul lots of stuff up them quickly and cheaply.
"The space elevator will be built about fifty years after everyone stops laughing" -- Arthur C Clarke.
It would be ace if someone could dig out a link the ancient newsgroup thread we had about Space Elevators. Also, once the current (7/3/2003) OUSFG Chat thread has finished, we should link to archives of that. Or summarise both the above. Or something.
You'd want to build one out of a fishnet tether <http://www.tethers.com/Hoytether.html>.
Possible cheap answer to Space Tourism.
What about Sky Hooks?
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