Britain's first official astronaut, Major Tim Peake, has entered the record books by becoming the first person to complete a marathon in space, by "running the London Marathon" on a treadmill at the same time that the London Marathon was taking place.
He ran the 26.2mi distance in about three hours, 35 minutes, the European Space Agency said.
The ISS circles the Earth at a relative velocity of 17,900mph, so Major Peake covered more than 53,000mi during his run - just over twice the circumference of Earth at the equator.
Tim Peake 'runs' London Marathon from space
By Paul Rincon Science editor, BBC News website
24 April 2016
Mr Peake finished in about three hours, 35 minutes
UK astronaut Tim Peake has run the distance of the London Marathon on a treadmill in the International Space Station (ISS).
To counteract the effects of weightlessness, he is using a harness to keep him on the running belt.
He ran the 26.2mi distance in about three hours, 35 minutes, the European Space Agency said.
Speaking before the event, Major Peake had called the marathon a "great challenge".
"I'm quite glad that this is happening later on in the mission so I've had plenty of time to get used to the T2 treadmill."
Elastic straps over the shoulders and round the waist keep Major Peake in contact with the running belt of the treadmill, located in the station's Tranquility Node.
The straps are designed to generate the foot force necessary to give astronauts' bones and muscles a workout in weightlessness.
He said: "One of the biggest challenges is the harness system. Obviously, my bodyweight has to be firmly attached to the treadmill by this harness, and that can rub on the shoulders and around the waist."
The Chichester-born astronaut ran the London Marathon in 1999, finishing in three hours, 18 minutes and 50 seconds.
He did not try to beat that time as his medical team wanted to ensure he was perfectly healthy for his return to Earth in June.
The ISS circles the Earth at a relative velocity of 17,900mph, so Major Peake covered more than 53,000mi during his run.
Major Peake started at the same time as the other runners: 10:00 BST on 24 April.
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Tim Peake 'runs' London Marathon from space - BBC News
He ran the 26.2mi distance in about three hours, 35 minutes, the European Space Agency said.
The ISS circles the Earth at a relative velocity of 17,900mph, so Major Peake covered more than 53,000mi during his run - just over twice the circumference of Earth at the equator.
Tim Peake 'runs' London Marathon from space
By Paul Rincon Science editor, BBC News website
24 April 2016
Mr Peake finished in about three hours, 35 minutes
UK astronaut Tim Peake has run the distance of the London Marathon on a treadmill in the International Space Station (ISS).
To counteract the effects of weightlessness, he is using a harness to keep him on the running belt.
He ran the 26.2mi distance in about three hours, 35 minutes, the European Space Agency said.
Speaking before the event, Major Peake had called the marathon a "great challenge".
"I'm quite glad that this is happening later on in the mission so I've had plenty of time to get used to the T2 treadmill."
Elastic straps over the shoulders and round the waist keep Major Peake in contact with the running belt of the treadmill, located in the station's Tranquility Node.
The straps are designed to generate the foot force necessary to give astronauts' bones and muscles a workout in weightlessness.
He said: "One of the biggest challenges is the harness system. Obviously, my bodyweight has to be firmly attached to the treadmill by this harness, and that can rub on the shoulders and around the waist."
The Chichester-born astronaut ran the London Marathon in 1999, finishing in three hours, 18 minutes and 50 seconds.
He did not try to beat that time as his medical team wanted to ensure he was perfectly healthy for his return to Earth in June.
The ISS circles the Earth at a relative velocity of 17,900mph, so Major Peake covered more than 53,000mi during his run.
Major Peake started at the same time as the other runners: 10:00 BST on 24 April.
Follow Paul on Twitter.
Tim Peake 'runs' London Marathon from space - BBC News