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For Buzz Aldrin, Neil Armstrong and Michael Collins, Apollo 11 marked the end of years of training and examinations.

Aldrin in particular had spent years in the US Air Force before eventually joining NASA.

But what does it take to join that select group of men and women who have been further than ever before?

Susan Buckle is the Education Programme Manager at the UK Space Agency.

"Tim Peake said one of the things he found most difficult was learning the Russian language...it's different, we were talking about the Apollo astronauts and they all had to be fighter pilots.

"The last selection of astronauts in 2009, we have females now.

"At the moment astronauts go up in Russian Soyuz space rockets... they have to get on and do tasks with each other every day."