It took European space scientists eight months to bite the bullet and formally agree on June 20 to start the $1 billion Euclid project devoted to the study of dark energy. In the end, with commitments from France, U.K. and Italy to fund instruments and ground structure, Euclid proved too compelling to set aside, despite far exceeding the funding allocated for what the European Space Agency calls its medium-class missions. The 2,160-kg (4,750-lb.) Euclid satellite is scheduled to launch to ...


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