A group of astronauts are trapped in orbit around the Earth after their space ship suffers catastrophic damage.
A rescue ship is available to bring them home, but there is a catch. It has only four seats ― and there are seven of them.
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It sounds like the nail-biting plot of a Hollywood film to rival the plight of Bruce Willis in Armageddon or George Clooney and Sandra Bullock in Gravity.
In fact, this is the real-life dilemma that could face astronauts on the International Space Station after a Russian Soyuz capsule was so badly damaged it may be beyond repair.
Russian cosmonauts Dmitry Petelin and Sergey Prokopyev and Nasa astronaut Frank Rubio arrived at the ISS in September on a Soyuz ship that was scheduled to take them home in March. Two weeks ago while docked at the ISS, the Soyuz sprang a huge coolant leak that some experts believe means it can no longer fly safely.
The only other spacecraft at the ISS is an American SpaceX Dragon, which carried a group of four astronauts, two from Nasa, a Canadian and a Russian, in October.
Plotting an escape route
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If the ISS needed to be evacuated in an emergency, this group could escape in the Dragon. For the remaining three, though, there would be no way home.
Russia’s space agency Roscomos is still assessing the extent of the damage to the Soyuz, as well as the possible cause.
Video taken on December 14 showed coolant streaming from the ship into the vacuum of space from a hole in a pipe less than a millimetre wide, with temperatures inside the capsule already rising.
The damage is thought to be the result of a strike from either a micro-meteorite or a tiny piece of space debris. Either way, the risks of using the ship during the heat of re-entry are high.