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Good deal! Twenty years ago, when NASA was already interested in us to learn more about its crown, it wondered how to design a satellite that could rotate around the poles of this 42 million km furnace, or 1/3 of the distance separating us from the Sun. From then on, building a device just for an experiment (SoloHI from US Naval Research) would have cost a fortune. So, NASA turned to the European Space Agency (ESA) to offer scientific collaboration. The deal was concluded wit