<p>neil, there are some problems with building a space elevator out to the earth-moon l1 lagrange point...</p><p> For instance, that lagrange point has an "orbital" period equal to the moons, ~28 days. The earth rotates...well, once per day. Any station you put there, isn't going to stay there if it's part of a space elevator, the earth's rotation will drag it away from that spot.</p><p> The only real place for the end statioin of a space elevator is at or near geosynchronous orbital height. That is, IIRC, the "low stress" position. Any higher, or lower, and the difference between the orbital period and earth's rotational period introduce extra strain.</p> <div class="Discussion_UserSignature"> <p align="center"><font color="#c0c0c0"><br /></font></p><p align="center"><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">--------</font></em></font><font color="#999999"><em><font size="1">----</font></em></font><font color="#666699">SaiphMOD@gmail.com </font><font color="#999999"><em><font size="1">-------------------</font></em></font></p><p><font color="#999999"><em><font size="1">"This is my Timey Wimey Detector. Goes "bing" when there's stuff. It also fries eggs at 30 paces, wether you want it to or not actually. I've learned to stay away from hens: It's not pretty when they blow" -- </font></em></font><font size="1" color="#999999">The Tenth Doctor, "Blink"</font></p> </div>