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。

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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。

youdao

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。

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There were new designs for the plane's rocket engine, landing equipment and the small rockets needed to move it in space.

VOA: special.2010.07.07

Boeing and Lockheed Martin have carried tons of satellites into space on their rockets.

VOA: special.2010.04.28

Its backers, who include Tom Clancy, a rich novelist, are betting that its radical design will prove superior to dreary old rockets and space-planes.

ECONOMIST: On a rotor-blade and a prayer | The

SpaceX was quick to make the point that the ability to carry on despite an engine failure demonstrates a big advantage of multi-engined rockets like the Falcon (Space Shuttles and Saturn V moon rockets could both do something similar).

ECONOMIST: SpaceX goes to the ISS

But Bigelow argues the balance of risk and reward is changing with low-cost private rockets and his own inflatable space stations, which could be modified for surface use.

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