PARIS — The European Space Agency (ESA) has postponed the launch of its €940 million ($1.25 billion) Gaia star-mapping mission by at least one month after the spacecraft’s manufacturer identified a technical problem with a component flying on another satellite already in orbit, the agency said Oct. 23. “Gaia shares some of the components involved in this technical issue and prompt notification of this problem has allowed engineers working on the final preparations for Gaia’s launch to ...


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