More importantly, scientists are already queuing for seats on these low-gravity space-flight services so they can collect data during a few minutes of weightlessness.

更重要的是，科学家们已经在排队争取这些低重力太空飞行服务的座位了，这样他们就可以在几分钟的失重状态下收集数据。

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Some of the equipment measures the effects of space conditions, such as apparent weightlessness, on biological specimens — including the crew.

其中一些设备用来测试太空环境(如明显的失重)对人体的影响——其生物样本包括乘组人员。

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What the six will not experience, however, is the impact of weightlessness or, indeed, the terror and euphoria that comes with real-life space travel.

不过，这六人不会经历的是失重影响，或者的确地，真实太空航行时的恐惧与狂喜。

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It tested instruments for controlling a vehicle in the weightlessness of space.

VOA: special.2010.07.07

During the two-and-a-half hour moon walk, the astronauts frolicked in the weightlessness of outer space and planted an American flag in the lunar surface.

VOA: standard.2009.07.16

Initially launching from Mojave, California, participants will get a view from the edge of space for several minutes and briefly experience weightlessness.

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That means Mars-bound astronauts will also have to skip out on the ground-based psychological support sessions that astronauts and cosmonauts working on the international space station routinely have just to make sure microgravity has not gone to their heads (Before Soviet cosmonaut Yuri Gagarin became the first man in space in 1961, experts were afraid weightlessness might cause schizophrenia, explained one doctor).

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And that's a great question because one of the hard things about long-duration space flight is the human body dealing with weightlessness and a lack of gravity.

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