Both Marshburn and Hadfield are scheduled to leave the space station at 7:08 p.m.
Hadfield, Marshburn and Russian cosmonaut Roman Romanenko are scheduled to leave the station Monday at 7:08 p.m.
Mr. Marshburn has been on the space station since December and is set to return to Earth late Monday.
At 8:44am EDT on Saturday, Astronauts Cassidy and Marshburn powered up their suits and headed outside the station to fix the leak.
FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak
"Sad to see the Dragon go, " astronaut Thomas Marshburn told Mission Control.
Astronauts Kevin Ford and Tom Marshburn of NASA and Chris Hadfield of the Canadian Space Agency will answer questions and provide insights about life aboard the station.
Christopher Cassidy and Thomas Marshburn installed the new pump after removing the old one suspected of spewing flakes of frozen ammonia coolant two days earlier.
But managers wanted to deal with the trouble now, while it was fresh and before Mr. Marshburn returns to Earth in just a few days.
Tom Marshburn from the United States and Chris Hadfield from Canada.
FORBES: Space Station Astronauts Will Be Watching The Super Bowl
On Saturday afternoon, NASA astronauts Chris Cassidy and Tom Marshburn successfully completed a spacewalk to repair a leaky component on the outside of the International Space Station.
FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak
Then on Monday, crew members Hadfield, Marshburn and Roman Romanenko will undock their Russian Soyuz from the station and head back to Earth for a planned 10:31pm EDT landing in Kazakhstan.
FORBES: Astronauts Perform Emergency Spacewalk To Fix Ammonia Leak
Before joining the astronaut corps in 2004, Marshburn worked as a flight surgeon for NASA. He flew to the space station once before, in 2009, on the STS-127 space shuttle mission.
On December 5, Russian cosmonaut Roman Romaneko, Canadian astronaut Chris Hadfield and NASA astronaut Tom Marshburn will launch from Kazakhstan to the International Space Station, which will give the station a 6-person crew until March, when Ford, Novitskiy and Tarelkin will leave.
Once on board, Cassidy, Vinogradov and Misurkin will join the rest of the crew of their mission, known as Expedition 35: Canadian Chris Hadfield, NASA astronaut Tom Marshburn, and Russian cosmonaut Roman Romanenko, all of whom have been on the station since December.
FORBES: New Crew Launches On Fastest Trip Yet To Space Station
"I've experienced 11 days docked at the space station, 16 days in space on my last flight, so getting back to life in zero gravity, that is never boring, everything from putting on your clothes to brushing your teeth to working to transfer of hardware, all of its fun in zero-g, " Marshburn told NASA before the launch.
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