And this is why, in rockets and space capsules, weightless astronauts and objects float about in the air.
这就是为什么在火箭和宇宙飞船里，失重的宇航员和物体会在空中漂浮。
In effect, therefore, NASA has decided that the successor to the space shuttle will be commercial rockets and spacecraft.
事实上因此，美国宇航局决定其继任者会是商业火箭与航天器。
They are in a condition of weightlessness. And this is why, in rockets and space capsules, weightless astronauts and objects float about in the air.
这就是为什么在火箭和宇宙飞船里，失重的宇航员和物体会在空中漂浮。
South Korea's space agency has been active for nearly two decades and, since 1992, has launched 11 satellites via other countries' rockets and space agencies.
韩国空间机构近20年来一直表现活跃，从1992年以来已通过其它国家的卫星和空间机构发射了11颗卫星。
At Space Camp, trainees can earn their Space Exploration badge as they build and fire model rockets.
在太空营，学员可以制作和发射火箭模型，以此获得太空探索徽章。
The rockets take astronauts and man-made satellites into space.
火箭把宇航员和人造卫星送入太空。
Two of them have already been sent up into space, using rockets and then later filled with air.
其中两个已经坐上火箭被送入太空，氧气也已备足。
From his father, he knew that scientists make rockets to carry things into space, and spaceships are used to carry people through space.
从他父亲那里，他得知科学家们制造火箭来把东西送入太空，而宇宙飞船是用来载人穿行太空的。
The unpiloted craft, which can take off from an airport runway, has no external rockets and two engines use hydrogen and oxygen to propel it more than 18 miles into space.
该无人驾驶工艺，它可以从一个机场的跑到起飞，没有外部火箭和两个引擎使用氢气和氧气来推动它进入太空超过18英里。
As space tourism increases, the soot and carbon dioxide emitted from rockets will contribute to climate change, new computer models predict.
根据新的电脑模型预测，随着太空旅游业的增长，火箭所排放的烟尘以及二氧化碳将会促使气候变化。
Aiming for space is about more than understanding flight paths and knowing the best rockets to use: moon shots are about taking risks.
太空计划不止是熟知飞行轨道和用什么样的火箭最好：载人登月是有巨大风险的。
For all its flaws, it was a bold idea: to replace the throw-away rockets that began the space age with a truck that could go in and out of orbit routinely.
鉴于它的所有缺点，这是个大胆的构想：以能够例行进出轨道的运载工具取代一次性的火箭而开启太空时代。
More than 80 flights of U.S. space shuttles and Russian rockets will be necessary to complete the International Space Station.
要完成建设国际空间站的工作，需要美国航天飞机和俄罗斯火箭进行超过80次太空飞行。
Iridium, usually used in space rockets, is ten times rarer than platinum and highly resistant to heat so theoretically it can be dropped it into lava, and it will not melt.
铱，通常被用于太空火箭，比铂金稀有十倍并且高度耐热，因此理论上即使它掉进岩浆中也不会熔化。
Space, rockets and science sprang out of the pages of the pulp science-fiction magazines he bought in Woolworths for threepence each, and which he could not always afford.
在他三便士一本从Wool worths那买到的低俗科幻小说杂志里，太空，火箭和科学跃然纸上，而他还时常支付不起。
This collection included, by the way, a series of 175 stamps with portraits of cosmonauts, rockets, and dogs, issued from '57 on, in honor of the Soviet space program.
顺便说一下，这个集邮本包括一套从1957年积攒下来的庆祝苏联航天计划的邮票，宇航员、火箭、狗的肖像一应俱全，总共175枚。
Proponents say space elevators would be cheaper, safer and more comfortable to operate than rockets, and speculate that the sensation would be akin to riding on a train.
太空电梯的支持者说，与火箭相比，太空电梯将更便宜、更安全和更舒适，并猜想乘坐太空电梯的感觉将类似于坐在火车上。
NASA has voiced support for using private rockets as "space taxis", ferrying astronauts to and from the International space Station.
美国宇航局已经表示支持使用私人火箭作为“太空的士”，运送宇航员来往于国际空间站。
Researchers hope that the hydrogen products of that reaction might go beyond launching rockets, and also feed hydrogen fuel cells for long duration space missions.
研究者希望化学反应后产生的氢，不仅能发射火箭，也能为长时间的空间任务补充氢电池。
Musk's rockets are ultimately intended to carry cargo and crew to the space station.
马斯科的火箭最终计划为空间站输送货物和宇航员。
The space agency is developing a new generation of rockets and crew capsules capable of reaching the moon which are due to fly within five years of the space shuttle fleet being retired next year.
美国宇航局正在研制能到达月球的新一代火箭和载人太空舱，计划在五年内搭载航天飞机进行发射，而目前的航天飞机将于明年退役。
The crews will fly on Russian Soyuz rockets until and unless U.S. commercial companies develop private space taxis to ferry them to the International space Station.
这个团队将参与俄罗斯“联盟”号火箭的飞行任务，知道美国金融公司开发出其专有的航天“的士”将飞往国际空间站。
The company's reusable rockets are designed to lift off for space and return several times a day.
该公司的火箭可以二次使用，其设计不但可以发射至太空中，还可以在一天中往返数次。
I have even been put into space rockets and sent to explore the Moon and Mars.
我已经被放进太空火箭并被送去探测月亮和火星。
Aluminum already represents a small but critical part of many rocket fuels, including the propellants for the space shuttle's solid booster rockets and NASA's next generation Ares rockets.
铝已经成为了许多火箭燃料小却关键的组成部分，包括航天飞机固体燃料推进火箭和国家宇航局下一代的Ares火箭。
At 11:29 a.m. Eastern Daylight Time on July 8, 2011, the space Shuttle Atlantis lit its rockets and roared into space.
2011年7月8日上午11：29(东部夏令时间)，阿特兰蒂斯号航天飞机点火发射，怒吼着升入太空。
I thought after a few decades of rockets they would come up with a space elevator or another way of getting into orbit, cheaper and safer.
我想发射几十年的火箭后，他们会造出太空扶梯，或是其他进入轨道的方法，更便宜，更安全。
I thought after a few decades of rockets they would come up with a space elevator or another way of getting into orbit, cheaper and safer.
我想发射几十年的火箭后，他们会造出太空扶梯，或是其他进入轨道的方法，更便宜，更安全。
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