Things got dicey yesterday aboard the International Space Station (ISS).Late in the day, Russian cosmonauts Sergey Prokopyev and Dmitry Petelin were preparing for a spacewalk when exterior cameras showed a stream of white flakes pouring from the Soyuz spacecraft attached to the station.Simultaneously, telemetry indicated a drop in pressure in the Soyuz's coolant tank, indicating that it was the source of the leak.
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