Have any astronauts floated away in space?
是否有航天員在太空中飄走？
原文地址：https://www.quora.com/Have-any-astronauts-floated-away-in-space
No. We use tethers to ensure that can't happen.
沒有，我們使用系繩來防止這類事件的發生。
In 1973, the value of those tether were proven when Pete Conrad and Joe Kerwin were doing an EVA on Skylab. They were trying to repair a solar array when it suddenly deployed, throwing them off of the space station. Their tethers were the only thing that stopped them from floating away to their deaths.
在1973年，當 Pete Conrad 和 Joe Kerwin 在天空實驗室執行艙外活動的任務時，就體現了系繩存在的價值。他們當時在維修太陽能電池板，突然太陽能電池板展開使得他們倆被甩到太空中，這時系繩是防止他們因此而喪命的唯一保護了。
In 1984, we did the first spacewalk without a tether. The purpose of that spacewalk was to test an MMU (Manned Maneuvering Unit) - essentially a jet powered backpack that allowed a crew member to control their movement in space.
在 1984 年，我們進行了第一次無系繩的太空行走。這次行走的目的在于測試 MMU （載人機動裝置），差不多就是一個能讓宇航員在太空中控制自身行動的噴氣背包。
Although we don't use that MMU today, we have a smaller version that US astronauts wear for emergency purposes, in case the tether fails.
雖然我們今天不再使用 MMU 了，為了防止系繩出現失效的狀況，我們現在使用一個比較小的太空激動裝置。
