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Emergency spacewalk to fix leak on ISS
Two crew members on the International Space Station headed out for an emergency spacewalk Saturday morning.
NASA said the leak appears to be fixed at this time.
The orbiter's cooling system was leaking ammonia at a rate of about 5 pounds a day.
The leak was first detected Thursday morning.
NASA held an around-the-clock emergency session to form a plan to fix the problem.
The entire spacewalk took 5 hours and 30 minutes -- an hour less than expected.
Ammonia is used to cool the solar arrays that provide electricity to the station's systems.