Spacewalkers Doug “Wheels” Wheelock and Tracy Caldwell Dyson pulled off an extremely important spacewalk, lasting 7 hours and 20 minutes, to rescue the International Space Station from overheating itself. Wheelock held and guided the 780 pound backup ammonia pump quite easily, as 220 miles above the earth it was basically weightless, and as he slid it into place, he and Caldwell Dyson both remarked “like butta.” The 2 then hooked up several power cables and connected all of the ammonia fluid lines. By Thursday, NASA will know for sure that everything is back to normal, after a couple of days of diagnostics testing followed by pumping the ammonia through the fuel lines of the S1 Radiator. When the original pump failed 2 weeks ago, that immediately cut the Space Station’s cooling capacity by 50%. Since then, all science experiments have been put on hold and all unnecessary equipment turned off. While the temperature in space is nearly minus 500 degrees Fahrenheit, there is so much electronics on the ISS that it must be kept cool, otherwise the whole orbital laboratory could short out. Maintaining temperature control is just as important as maintaining oxygen levels and power. Watching on tv monitors in Houston at the Johnson Space Center, NASA employees saw Wheelock’s checklist on his forearm as he held it up to his helmet camera. The last thing on the list was “Game Over.”