SlyReaper wrote:AvatarIII wrote:gmalivuk wrote:No, only L1 is between the two, and it marks the point where something goes from being pulled toward the Moon to being pulled toward the Earth.Wnderer wrote:I was thinking about the Lagrange points, but maybe the cable would naturally be pulled through the Lagrange points. But then there are two of those between the earth and moon.
so the centre of gravity of the cable would have to be in L1?
iirc, one of the hardest things about going to the moon is landing with no air resistance, a space elevator would certainly help on that front.
The center of gravity would have to be above the L1 point, otherwise anything climbing the cable would pull the whole thing down.
Unless the mass of the cable was sufficiently large compared to the elevator car, then any movement caused by the climber would be minimal, there would probably need to be jets of some sort to keep the cable stable anyway.
besides, the further beyond the L1 point that the centre of gravity is, the more tension there would be on the cable.
an alternative would be having 2 cars of equal mass that go back and forth between the 2 ends and the L1 point, meeting at the middle, transferring contents (if mass to and from the moon was always balanced, which I suppose, if you want more mass going to the moon, you could always transfer moon rocks off, simply for the purpose of keeping masses equal) and then going back to the ends, which would keep the cable balanced.