Space activity has produced valuable inventions such as global positioning devices that have had lucrative commercial applications.

航天行为已经产生了像全球定位装置这种赚 钱的商业应用的有价值发明。

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The paper briefly introduces space radiation environment, biological effects of space radiation and limited absorbed dose bound to Astronaut in space activity.

文章简要阐述了空间辐射环境、空间辐射生物学效应与航天员的辐射剂量限值等问题。

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She said the potential approval for Moon Express could provide a framework for the future licensing of private space activity such as SpaceX's plans to go to Mars in 2018.

她称月亮快车获得批准的可能性为未来私人太空活动，例如太空探索技术公司的2018年前往火星计划，提供一个得到许可的蓝图。

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Its ultimate aim is to build a series of laser tracking stations in various countries to provide a defensive shield for activity in space.

VOA: standard.2010.07.24

"This fly-by is a very high-risk space activity, " said the mission's chief engineer, Marc Rayman.

CNN: Spacecraft set for risky asteroid flyby

It is extremely hard for UK citizens to get into orbit because the government does not fund manned space activity.

BBC: Honour given to 'UK astronauts'

The price makes the 14 May launch the single most valuable flight for pure science in the history of European space activity.

BBC: Telescopes given 'go' for launch