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The Shijian-21 was sent into geosynchronous orbit in January and moved a defunct BeiDou navigation satellite to “to a high graveyard orbit above GEO,” the report said.

The purpose of another rendezvous would be to install a propulsion module for guiding the telescope’s plunge into the atmosphere or boosting it into a stable, high-altitude graveyard orbit.

These include ensuring there is enough propellant at the end of a satellite's life so that it can be pulled out of the sky or at the very least pushed into a graveyard orbit.

The first is that, when a satellite reaches the end of its use period, it's common to simply "abandon the spacecraft" instead of spending extra money to propel it into a "graveyard orbit," meaning an orbital path away from other satellites.

In his lab at the University of Colorado at Boulder, Shaub has been working on an "electron gun" — akin to the sci-fi concept of a tractor beam — that would shoot electrons at a target, allowing the operator to slow the object down or redirect it towards a graveyard orbit.