each other to maintain the orbit. Thus all they need to do is come up on them from behind with a scoop or two travelling just a little above the orbit speed and catch the items as they slowly pass them. Dump into cargo hold, hang out scoop again. Clear that lane and move to the next lane. Very much like dredging a harbour or river channel.

Ever seen the film of a car driving up a ramp into the back of a moving truck, same basic principle. Just be a little faster than what you want to catch.