International Space Station crewmembers Chris Cassidy and Tom Marshburn are preparing for an emergency spacewalk this weekend to investigate a coolant leak on the station’s oldest solar-power system module. The hastily planned excursion could come as soon as Saturday, ISS commander Chris Hadfield said by Twitter May 10. Spacewalk planning has interrupted preparations for the scheduled May 13 departure of the Soyuz TMA-07M, which was due to return Hadfield, Marshburn and cosmonaut ...


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