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The European Union has launched its latest Sentinel Earth observation spacecraft. Sentinel-3b is a multipurpose satellite, but will concentrate much of its work over the oceans, monitoring their behaviour and health. The spacecraft went up on a converted intercontinental ballistic missile from Russia's Plesetsk Cosmodrome. It will join an identical platform, Sentinel-3a, which was sent into orbit two years ago. [Source: BBC News]
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