Launch of a Cygnus spacecraft may be delayed while engineers troubleshoot a cooling system pump failure on the International Space Station (ISS). The U.S.-led ISS mission management team (MMT) deferred a go/no-go decision on the planned Dec. 18 launch after a faulty flow-control valve forced a shutdown of non-critical systems tied to one of the station's two external cooling loops. The valve regulates the temperature of ammonia circulating through an external ISS radiator that juts from the ...

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