Tim Peake is due to return home on Saturday morning after spending six months in space.
He became the first Briton to serve a mission as an ISS astronaut as his rocket arrived at the International Space Station from Kazakhstan in December 2015.
Peake - originally from Chichester and a graduate of the Royal Sandhurst Military Academy - beat 8,000 other applicants to bag one of only six places on the European Space Agency’s (ESA) astronaut training program.
But what does it take to become an astronaut with the European Space Agency?
European space missions have sent more French to space
More French people have had to undergo this training than any other nationality - with seven French astronauts undertaking ESA missions, out of a total of 28.
Germany and Italy have each sent six people into space with the ESA, while Tim Peake is Britain's first.
There have been more male astronauts
The ESA was established in 1975, and since then the agency has recruited 28 astronauts. 15 are still active today.
Of these, 25 have been men and only three have been women. One of these women, Marianne Merchez, never undertook a space mission.
Italian astronaut Samantha Cristoforetti holds the record for the longest single spaceflight by a woman, spending 199 days and sixteen hours on the ISS in 2014/15
Tim Peake was joined by two other men on his mission, Russian cosmonaut Yuri Malenchenko and Nasa's Tim Kopra.
Engineers and pilots have the best chance
Half of Europe's astronauts have had previous experience of flying.
Alongside this, more than half of them have engineering expertise. A third have physics expertise and 11 per cent have a background in medicine.
You need to have spent 88 days in space
By the time Tim Peake's feet hit Earth again, the fifteen current members of the European Astronaut Corps will have spent a total of 1,438 days - or four years - in space.
Dutch astronaut André Kuipers orbited the earth longest clocking up 203 days and Denmark's Andreas Mogens the shortest, spending only nine days in space.
On average, the current set of astronauts have spent 100 days in space. Tim Peake will have spent 185 days in space by the time he returns on 18 June, despite having no experience of space before taking off for the ISS.
This article has been amended to reflect the fact that Time Peake's arrival to Earth has been delayed from Sunday 5 June to Saturday 18 June 2016.