办事指南

Satellites and space debris

点击量:   时间:2017-05-18 08:02:10

By Hazel Muir WHEN Sputnik 1 beeped its way around the Earth in 1957, space was a very tranquil place. How things have changed. Today some 5000 tonnes of stuff is whirling around above our heads – equivalent to more than 660 of London’s classic double-decker buses. Some of these objects are satellites in the everyday sense – precision instruments doing a sterling job of relaying communications or monitoring our environment and alleviating the impact of natural disasters. The rest, however, include anything from clapped-out rockets to shrapnel and other useless rubbish,