On Sun, 22 Oct 2000 JamesOberg@aol.com wrote: > I wish they had gotten the "Firefly" electrodynamic tether launched and > deployed, it's good for at least partial anti-drag reboost. Is there a point at which tethers are no longer viable? If an object gets too low in the atmosphere, is the drag too great for a low-thrust system like a tether to overcome? DDAY