Enlarge / A view of the aft end of the Soyuz spacecraft leaking what appears to be ammonia on Wednesday night.NASA TV
A Russian spacewalk was canceled at the last minute on Wednesday night when a spacecraft attached to the International Space Station unexpectedly sprang a large leak.
Cosmonauts Sergey Prokopyev and Dmitri Petelin were dressed in spacesuits, with the airlock depressurized, when flight controllers told them to standby while the leak in a Soyuz spacecraft was investigated. The spacewalk was subsequently called off shortly before 10pm ET (03:00 UTC Thursday).
The leak appears to have originated in an external
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