Billionaires in space

More and more billionaires are jumping on rockets to try to reach space. Richard Branson was the first with Virgin Galactica, Jeff Bezos was next with Blue Origin, and they're both competing against Elon Musk's company SpaceX. The question is, what's in it for the rest of humanity? Today on the Signal, the dawn of the new space age and the billionaires funding it. What's it going to achieve, and is it worth the cost? Featured: Dr Bradley Tucker, Astrophysicist and Cosmologist, Australian National University Dr Eloise Marais, Associate Professor in Physical Geography, University College London