How much energy needs to be be expended to throw a non operating satellite (or other space trash) out of orbit (L4 or L5) or L2 into deeper space.... thus minimizing space debris in earth orbit. I could only find formulas for getting an object INTO orbit.... Background of question: we were discussing space debris and the seemingly endless number of monitored pieces of debris in various orbits around earth. Discussion gravitated towards; 1. Collect trash, and reuse... compact it, melt it, build stuff.... I don’t know.... 2. Collect trash, compact it and throw (send) it to deeper space out of orbit. I’m trying to figure a way to collect it.... also want to know how to dispose of it.