What is SpaceX? How does it make money?

The company is set to make history as, alongside Nasa, it sends two astronauts to the International Space Station - the first time a private company has done this.

The launch from the Kennedy Space Center in Florida is scheduled for 16:33 local time (20:33 GMT / 21:33 BST).

Science correspondent Laura Foster takes a closer look at the company's aims.

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