Have any astronauts floated away in space?
是否有航天员在太空中飘走？
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.
没有，我们使用系绳来防止这类事件的发生。
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，当 Pete Conrad 和 Joe Kerwin 在天空实验室执行舱外活动的任务时，就体现了系绳存在的价值。他们当时在维修太阳能电池板，突然太阳能电池板展开使得他们俩被甩到太空中，这时系绳是防止他们因此而丧命的唯一保护了。
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，我们进行了第一次无系绳的太空行走。这次行走的目的在于测试 MMU （载人机动装置），差不多就是一个能让宇航员在太空中控制自身行动的喷气背包。
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.
虽然我们今天不再使用 MMU 了，为了防止系绳出现失效的状况，我们现在使用一个比较小的太空激动装置。
