Satellites that have "died a natural death" --along with the rockets that carried them into space and boosters discarded along the way--become space rubbish that is difficult to deal with and highly dangerous.
「壽終正寢」的衛星，連同載它上天的火箭，和沿途「邊走邊丟」的推進器，都成了難以處理且危險度高的「太空垃圾」。