According to a latest report, two brilliant astronauts from NASA have recently repaired a critical cooling system pump at the International Space Station.

Researchers have revealed that this task was accomplished by two US astronauts namely Rick Mastracchio and Mike Hopkins.

Sources have revealed that the task was completed successfully after 7.5 hours spacewalk by the scientists.

This spacewalk was done by scientists in order to replace the faulty ammonia pump whose internal control valve failed earlier this month, according to NASA.

This space walk at the Christmas Eve resulted in the successful restart of the new pump, according to the scientists from NASA.

The pump was successfully restarted by flight controllers in the Mission Control Center at NASA's Johnson Space Center in Houston, as per the sources.

It has been revealed by researchers that the pump module is responsible for controlling the flow of ammonia through cooling loops and radiators outside the space station. Also, when this pump module is combined with water-based cooling loops inside the station is successfully removes surplus heat into the vacuum of space.

Researchers say that the new pump is now fully functionable, but on the other hand it will still take some more time in order to completely regenerate.