CNN News: 宇航员在太空中并不孤单

Two hundred forty-nine miles over our heads, astronauts on the International Space Station recently discovered they`re not alone. It`s not aliens, though. It`s bacteria -- specifically, Corynebacterium and Propionibacterium. Scientists think it just hitched a ride on space cargo to get to the station.

最近国际空间站的宇航员在我们上空249英里发现他们并不是孤零零的。但是陪着他们的不是外星人，是细菌啦——确切的来说，是棒状杆菌属和丙酸菌属。科学家认为这些细菌只是搭载太空货物来到了空间站。

Many of us have encountered both of these bacteria. The first one causes respiratory infections. The second one, acne. But that`s on earth.

我们很多人都遇见过这些细菌。第一种细菌可以引起呼吸道感染，而第二种细菌可以引发粉刺。但是我们遇见这些细菌是在地球上。

Scientists think weightlessness could cause bacteria to behave differently.

科学家认为失重可以导致细菌的行为有所不同。

And as NASA aims for longer, farther missions away, like one to Mars, they`re keeping close tabs on bacteria and astronauts health.

美国宇航局计划时间更长、距离更远的任务，例如出发去火星，他们会密切关注这些细菌和宇航员的健康。

The International Space Station orbits the Earth every 90 minutes, traveling about 17,500 miles per hour.

国际空间站绕地球转动一周的时间是90分钟，同时速度为每小时17,500英里每小时。

But daily life in lower Earth orbit is hard work, and at times complicated. Even getting clean is a challenge. No shower here, instead, they use towels, wipes and a rinse-less shampoo.

但是在地球低轨道进行日常生活是一件困难的事情，甚至有时候会非常复杂。甚至清理干净是一项挑战。在低轨道上不能洗澡、因此，宇航员使用毛巾擦洗，同时使用一种不同冲洗的洗发露。

On board this $100 billion research laboratory, there are never more than six crew members at a time. They stay for about six months, which can feel like an eternity living on pre-packaged food.

在太空舱的价值1000亿美元的实验室里，乘务人员从没有一次超过6人。他们在那里呆半年，就像永远生活在预先包装好的食物里。

There are no refrigerators in space, and salt and pepper only in liquid form, otherwise the particles would be airborne, clogging air vents or getting in an astronaut`s eye. Peanut butter on a specially packaged tortilla is a space station staple.

在太空里没有冰箱，同时只有液态的盐和辣椒，否则的话这些颗粒将会随空气漂浮，这样就会堵塞通风口、并进入宇航员的的眼睛。经过特殊包装的花生酱是空间站上的主要产品。

A weightless tortilla. OK. We got one tortilla. Wow, it got away.

一个失重的玉米饼。好的，我们拿到了一个玉米饼。天呀，它又飘走了。

Most of the day is spent working on science experiments that only a micro-gravity environment can provide.

一天的大部分时间都会花在科学实验上，而这是实验只有在微重力的条件下可以做。

There are also medical experiments, which can judge how well their bodies adjust to life in space for long periods of time.

同时还有医学实验，这些医学实验可以判断人体在太空长时间的适应程度。

And while you may be weightless in space, exercise is a must using equipment you won`t find on Earth, like this treadmill.

尽管你在太空中是失重的，锻炼是必须的，需要使用在地球上找不到的设备，例如这种特殊的跑步机。

Sleeping is easier, as long as the astronauts remember to tie down their sleeping bags.

睡觉是一件比较容易的事情，只要宇航员记得要躺在自己的睡袋里面哦~