Elon Musk is the billionaire owner of SpaceX and Tesla Motors, and the co-founder of Paypal. He plans to colonise Mars. Last week that dream might have been scuppered as his SpaceX rocket exploded on the Launchpad in Cape Canaveral, Florida. This is the first time a rocket has exploded at launch since 1960. It was carrying a satellite Facebook wanted to use to provide internet access to Africa. While investigations continue into what caused last week's explosion, this week Mark Coles explores the life of the man who also wants to make the travel time from London to Manchester 18 minutes and to counter global warming.

Producers: Charlotte Pritchard and Phoebe Keane.