The astronauts will joint the three crew currently on the ISS
Three astronauts are set to launch to the International Space Station where they will raise the outpost's crew from three to six for the first time.
Belgian Frank De Winne, Canadian Robert Thirsk and Russian Roman Romanenko are due to blast off from the Baikonur Cosmodrome, Kazakhstan, at 1134 BST.
Rather than coming straight home, the current residents will stay aboard the ISS with the new arrivals.
After four months, Mr De Winne will take over as commander of the ISS.
This will mark the first time a European has taken charge of a crew in orbit.
The astronauts will arrive at the space station two days after launch, joining the current crew - Russian cosmonaut Gennady Padalka, Nasa astronaut Michael Barratt and Japanese astronaut Koichi Wakata.
The Soyuz TMA-15 is set to dock with the space station at 1336 BST on Friday.
Mr Thirsk called the expansion from a three-person to a six-person crew a "milestone" and said one of the mission goals was "to prove the station can support six people for a long duration".
A primary objective will be to assess how well such a large number of people live together in the cramped confines of the space station.
"What we'll do over the next months will be to prepare for future space exploration," Mr De Winne told the Associated Press news agency.
Severe winds at the launch site have raised last-minute concerns the flight could be cancelled.
The voyage will mark the first time all five ISS partner agencies will be represented by crew members on the orbiting outpost.
Mr De Winne, a European Space Agency (Esa) astronaut, will spend six months aboard the space station, initially as a flight engineer.
After a crew rotation due in October, he will take over as commander for Expedition 21 to the space station.
Belgian Frank De Winne, Canadian Robert Thirsk and Russian Roman Romanenko are due to blast off from the Baikonur Cosmodrome, Kazakhstan, at 1134 BST.
Rather than coming straight home, the current residents will stay aboard the ISS with the new arrivals.
After four months, Mr De Winne will take over as commander of the ISS.
This will mark the first time a European has taken charge of a crew in orbit.
The astronauts will arrive at the space station two days after launch, joining the current crew - Russian cosmonaut Gennady Padalka, Nasa astronaut Michael Barratt and Japanese astronaut Koichi Wakata.
The Soyuz TMA-15 is set to dock with the space station at 1336 BST on Friday.
Mr Thirsk called the expansion from a three-person to a six-person crew a "milestone" and said one of the mission goals was "to prove the station can support six people for a long duration".
A primary objective will be to assess how well such a large number of people live together in the cramped confines of the space station.
"What we'll do over the next months will be to prepare for future space exploration," Mr De Winne told the Associated Press news agency.
Severe winds at the launch site have raised last-minute concerns the flight could be cancelled.
The voyage will mark the first time all five ISS partner agencies will be represented by crew members on the orbiting outpost.
Mr De Winne, a European Space Agency (Esa) astronaut, will spend six months aboard the space station, initially as a flight engineer.
After a crew rotation due in October, he will take over as commander for Expedition 21 to the space station.
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