Thousands of people could be living in floating space colonies orbiting the Earth in 20 years' time, according to the head of a project by the British Interplanetary Society (BIS).

And, while life in space might sound unappealing to some, Jerry Stone believe it could actually be healthier than planet Earth, enabling people to live longer and, eventually, grow taller.

Mr Stone, author of the book One Small Step about the moon landings, and other members of the BIS have been updating research carried out in the US in the 1970s into how humans could start living in space in large numbers.

In a speech in Aberdeen as part of British Science Week, Mr Stone will claim humanity is now close to the point where such colonies could be built using material taken from the Moon and asteroids.