If my harpoon allows me to accelerate&#x2F;decelerate at 10g for 1 minute, I&#x27;d gain 5.9km&#x2F;s. This requires a tether that&#x27;s 176km long. That would be a pretty long tether; that can take a lot of weight.<p>But lunar orbit insertion requires a delta-v of only 2km&#x2F;s. Maybe one day, on the far side of the moon there will be a great magnetic hook that space ships will shoot their harpoon at in order to quickly insert into moon&#x27;s orbit.