Have you got £15 million to spare? There have been two space tourists so far: 61-year-old American businessman Dennis Tito paid to go into space on a Russian space vessel. Mark Shuttleworth the South African business tycoon has just finished his week's training and is set to become the world's second paying space traveller when he visits the International Space Station aboard a Russian ship in April.

Up until now, NASA has opposed private individuals paying to go into space. Until now, that is. NASA has now published a set of rules which all potential space travellers must meet before being allowed into a spacecraft.

NASA's chief astronaut, Charles Precourt, who helped draw up the rules, said: 'We don't want to embarrass our space partners by having [a tourist] who would be so controversial that it would be an insult to the other partners to fly them because of some behavioural background that was considered distasteful.”