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The main issue is a material that can form a rope 100km long and still support its own weight does not exist.
There's also some solutions that do not tether to the ground, but hang into the atmosphere; this allows them to move and the top end to be in a lower orbit. An aircraft is used to get to the bottom of the tether.
To be in geosynchronous orbit the tether needs to be around 35,000 km long!
is about 62 Gpa (Gigapackard)
Quote from: Phractality on 29/03/2011 05:11:13is about 62 Gpa (Gigapackard)Unless you are talking about a really big US automobile, I think you might mean 62 GPa (gigapascals)