BAIKONUR: A Russian Soyuz spacecraft with three crew on board successfully docked at the International Space Station on Saturday after blasting off from Kazakhstan, NASA said, launching a year-long mission on the orbiting outpost.
The Soyuz-TMA16M spacecraft's crew included a US astronaut and a Russian cosmonaut who will be the first to spend an entire year on the ISS.
The successful docking occurred after the Soyuz took off without a glitch from the Baikonur cosmodrome in Kazakhstan at 22:42 pm (1942 GMT) Friday, Russian space agency officials said earlier.
The hatch opened about two hours later at 0333 GMT, once the pressure between the two space vessels had equalised.
The three exchanged enthusiastic hugs with crew members already on board the ISS after the hatch opened.
NASA flight engineer Scott Kelly and Russian Mikhail Kornienko will together spend a total of 342 days aboard the ISS, while the third crew member, Russian cosmonaut Gennady Padalka, will spend the usual period of six months.
Kelly, 51, and 54-year-old Kornienko will take part in the extended mission to test the effects of long-term space missions on the human body.
The trip marks the longest amount of time that two people will live continuously at the ISS, though a handful of Russian cosmonauts spent a year to 14 months at the Russian space station Mir in the 1990s.
"This is the first time we're doing it as an international partnership, which I think is one of the great success stories of the International Space Station," Kelly said at a news conference in Baikonur ahead of the launch.
He said the experiment could prove vital towards planning future international missions, including to Mars.
"If we ever go beyond low Earth orbit again, perhaps to Mars, because of the cost and the complexity it will most likely be an international mission, so I see this as a stepping stone to that."
The physical effects of a year in space will be closely monitored by doctors on the ground in an unprecedented study of how the human body withstands the rigours of spaceflight before humans plan to journey to Mars.
NASA said the mission was key to planning a future trip to Mars, as it would provide valuable research.
"Scott Kelly's mission is critical to advancing the administration's plan to send humans on a journey to Mars," NASA administrator Charles Bolden said.
"We'll gain new, detailed insights on the ways long-duration spaceflight affects the human body."
Kelly said he was concerned about the impacts of radiation and living in zero gravity, particularly in terms of compromised immunity and bone and vision loss.
"I'm hopeful that there is not a big cliff out there with regards to our ability to stay and live and work in space for longer periods of time," he said.
"But we are not going to know that until we have actually done it," he added.
"The jury is out."
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