A spacewalk for maintenance on the International Space Station was aborted Tuesday after Italian astronaut Luca Parmitano experienced a water-like substance building up inside his helmet. Parmitano and U.S. astronaut Chris Cassidy completed less than an hour of their scheduled six-hour spacewalk to prepare the station for a Russian laboratory. Parmitano was uninjured, but 1 to 1.5 liters of liquid accumulated inside his spacesuit during the event.

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