As travel on Earth has become more accessible and affordable, space tourism looks set to be the future. Companies like Virgin Galactic and Blue Origin (pictured), founded by Sir Richard Branson and Amazon billionaire Jeff Bezos respectively, have begun offering suborbital flights, giving passengers some time in space and the chance to experience microgravity.

Elon Musk’s enterprise, SpaceX, is the only space tourism company so far to send private civilians into orbit and onto the International Space Station (ISS). With each passenger reportedly paying $55 million (£43m) for the privilege, a week on the IIS remains out of reach for most… but for how long?

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