Thermal convection will not operate in zero gravity.

热对流在没有引力的情况下是不会产生的。

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The main section was a narrow tube filled with electronics and crew members living in zero gravity.

其主要部分是一个载满电子设备和飞行员的狭小的管道，以供他们在失重情况下生活。

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In 1999, NASA sent ladybugs and aphids up in the space shuttle to test their movements in zero gravity.

1999年，NASA(美国航空航天局)将瓢虫和蚜虫带上了航天飞机以测试它们在失重状态下的行动。

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The possibilities for things to do in zero gravity are endless.

ECONOMIST: Space tourism

Atlantis is also carrying up to a million microscopic worms as part of an experiment to help scientists understand why human muscles waste away in zero gravity.

BBC: Shuttle docks with space station

Space is a good place for gerontological study, because of similarities between what happens to a body in zero gravity and what happens naturally over time on Earth.

CNN: It's official: Glenn will return to space