Answer:
Space debris (also known as space pollution, space waste, space trash, or space garbage) is defunct artificial objects in space—principally in Earth orbit which no longer serve a useful function.
There are four techniques that can move debris from heavily trafficked orbits: (1) deorbiting (the deliberate, forced reentry of a space object into the Earth's atmosphere by application of a force, usually via a propulsion system) at EOL; (2) orbital lifetime reduction