Listening to Richard Branson over the past 20 years, you'd be forgiven for assuming that space was by now being frequented by lots of tourists. However, despite the Virgin Galactic chief's optimism, the space tourism industry has yet to take off. Up to now there have been only seven self-funded citizens in space. And with billionaires such as Jeff Bezos and Elon Musk in the space race, why are there still no tourists in space? Subscribe to The Guardian on YouTube ► http://is.gd/subscribeguardian For a deeper dive into the world of Space Tourism, check out Alan Ladwig's book ► https://www.amazon.co.uk/See-You-Orbit-Dream-Spaceflight/dp/1733265708 Support the Guardian ► https://support.theguardian.com/contribute Today in Focus podcast ► https://www.theguardian.com/news/series/todayinfocus Sign up for the Guardian documentaries newsletter ► https://www.theguardian.com/info/2016/sep/02/sign-up-for-the-guardian-documentaries-update The Guardian ► https://www.theguardian.com/ The Guardian YouTube network: Guardian News ► http://is.gd/guardianwires Owen Jones talks ► http://bit.ly/subsowenjones Guardian Football ► http://is.gd/guardianfootball Guardian Sport ► http://bit.ly/GDNsport Guardian Culture ► http://is.gd/guardianculture