Elon Musk"s company, SpaceX, is already taking passengers into orbit. The billionaire entrepreneur is bringing down costs with a reusable rocket. Not to be outdone, Amazon"s Jeff Bezos wants to build a commercial orbiting station, called Orbital Reef.Helen Sharman, who was the UK"s first astronaut, on a mission to the Soviet Space Station Mir in 1991, believes that current international rivalries could be put in the shade by the pragmatism of the private sector.