A Soyuz capsule carrying Roman Romanenko, Chris Hadfield and Tom Marshburn landed safely in Kazhakstan after 146 days in space.
Following an ammonia leak reported Thursday morning, NASA is planning a spacewalk to investigate a radiator on the P6 truss.
SpaceX's CRS-2 mission began successfully, but hit a snag when a thruster propellant valve failed to work properly.
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