Only the European Space Agency and the US have previously sent probes there.

之前只有欧洲航天局和美国航天局发送过探测器到那里。

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And the European Space Agency planed the trial.

欧洲太空总署策划了该实验。

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Photograph by NASA/European Space Agency (ESA)

美国国家航空航天局/欧洲空间局（简写ESA）

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The European Space Agency (Esa) is about to lose the use of one of its flagship satellites.

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Vega is the latest rocket to be developed by the European Space Agency (Esa).

BBC: Esa's Vega rocket puts Proba-V vegetation mission in orbit

You may be aware of Goce, the European Space Agency's gravity mapping satellite.

BBC: Satellites have an electric future