From Silicon Valley to Valles Marineris--is humanity ready for Elon Musk's Mars vision?

Entrepreneur Elon Musk has laid out plans for his aerospace company SpaceX to transport human beings to and from Mars. His presentation, held at the International Astronautical Congress in Mexico, had been long anticipated, with many expecting a vision for the colonisation of Mars - something Musk has often spoken about in interviews. In the end, he presented something quite different.