"It looks very scary, " Russian cosmonaut Oleg Kotov told reporters via a video link.
"Koptev said that according to his information the next amateur cosmonaut would not be Russian, " Interfax said.
Hadfield, Marshburn and Russian cosmonaut Roman Romanenko are scheduled to leave the station Monday at 7:08 p.m.
The longest any human has stayed in space so far is about 13 months, held by a Russian cosmonaut.
Russian officials said Tito, who is divorced with three grown-up children, received the equivalent of a professional cosmonaut's training.
You are playing a cosmonaut fighting their loneliness by playing a game in which they can interact with a stranger.
Before testing your stamina, an in-house doctor will examine you, and an actual cosmonaut will have to be present to conduct the training.
On Sunday at 3:40pm EDT, Commander Chris Hadfield will hand command of the Space Station over to Russian Cosmonaut Pavel Vinogradov.
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The longest any person has spent in space is 14.5 months, a record set a decade ago by cosmonaut Valery Polyakov.
BBC: NEWS | Science/Nature | Astronauts may get time extension
Many more creatures soared into space in the years to come, until Soviet cosmonaut Yuri Gagarin orbited Earth in April 1961.
They are expected to live on Alpha until December, replacing Russian cosmonaut Yury Usachev and U.S. astronauts Jim Voss and Susan Helms.
All that reminds us of the cosmonaut in Klushino is the sagging road sign with peeling, discoloured paint, and an old one-storey house.
BBC: Yuri Gagarin's Klushino: Forgotten home of space legend
This has not stopped speculation that it will be Chen Long, a fighter pilot who has been to Russia to train with the cosmonaut programme.
On December 21, another Soyuz will launch from Kazakhstan with NASA astronaut Don Pettit, Russian cosmonaut Oleg Kononenko and European Space Agency astronaut Andre Kuipers.
The cramped capsule carrying NASA's Karen Nyberg, Russian cosmonaut Fyodor Yurchikhin and Italy's Luca Parmitano orbited the Earth four times before docking with the space station.
On April 12, 1961, Russia started the 20th century space race, sending its first cosmonaut, Yury Gagarin, into orbit for 108 hours aboard the Vostok spacecraft.
Then, in 1961, a young cosmonaut named Yuri Gagarin lent his human face to a new extraterrestrial space era that threatened to leave the U.S. behind.
Then in 1961, a young cosmonaut named Yuri Gagarin leant his human face to a new extraterrestrial space era that threatened to leave the U.S. behind.
The cosmonaut's family and friends, as well as a handful of people from the city of Gagarin, have been looking after the place as best they can.
BBC: Yuri Gagarin's Klushino: Forgotten home of space legend
When Soviet Cosmonaut Yuri Gagarin traveled to outer space, he opened up a whole new age in space travel and exploration for the rest of the world.
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Valentina Tereshkova (Russian Federation), Deputy at the Yaroslavl Duma and the first female cosmonaut, is also expected to contribute to the round tables with a video message.
Until three years ago, Star City, the cosmonaut training centre on the outskirts of Moscow, was that place -- a secret military facility that was unmarked on the world map.
"Yuri was a very bubbly, fun-loving boy, " says Ms Yakovleva, who has spent years studying the life of the cosmonaut and his family, talking to his relatives and friends.
BBC: Yuri Gagarin's Klushino: Forgotten home of space legend
At the same time, you are sitting alone in the 21st century, interacting with a stranger by playing the part of a cosmonaut playing a game in a game.
It was fifty years ago today that Soviet cosmonaut Yuri Gagarin blasted off from a launch pad in the Soviet Union to bravely go where no man had gone before.
Then, three and one half years later, a young cosmonaut named Yuri Gagarin leant his human face to a new extraterrestrial space era that threatened to leave the U .
Last night, American astronaut Sunita Williams of NASA, Japanese astronaut Akihiko Hoshide and Russian Cosmonaut Yuri Malenchenko left the International Space Station which has been their home for the past 4 months.
They'll eventually be joined by NASA astronaut Karen Nyberg, Russian cosmonaut Fiyodor Yurchikhin and European Space Agency astronaut Luca Parmitano, who are due to launch aboard a Russian Soyuz spacecraft on May 28.
He'll blast off in a Russian capsule, and after it docks with the space station, he'll be able to shake hands with Sergei Volkov, the first child of a Russian cosmonaut to go up.
The International Space Station will gain its full crew complement of six next month, when NASA astronaut Don Pettit, European Space Agency astronaut Andre Kuipers, and cosmonaut Oleg Kononenko launch from Kazakhstan on December 21.
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