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buy decadron online Rosetta was originally approved as a followup probe to Europe's previous comet mission, Giotto, which flew close to Halley's comet in 1986. It was finally approved in 1993 and built over the following decade. "That means it has been constructed using late-1990s technology," says Wright. "Its cameras are probably not as good as the one in your mobile phone today, for example. Nevertheless, it is a very ingenious, sophisticated spacecraft."