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Of course, Musk's life has already changed. You can't be a real-life Tony Stark with plans to retire to Mars and not generate publicity. But it has not been easy for him. Musk, beneath his shell of otherworldliness, is charming and funny, but he finds being in the public eye difficult. He would prefer to spend his time happily working on his rockets, not giving interviews. "I had to learn to be a little more extroverted," he says. "Ordinarily, I would sit in design meetings all day, exchanging ideas with people. But if I don't tell the story then it doesn't get out, and I want to try and get public support for extending life beyond Earth."
Unfortunately, Musk has discovered that celebrity has a dark side. In his case, that was a painful divorce from his ex-wife, Canadian author Justine Musk, with whom he has five children. The split generated its fair share of media attention, not least because Justine has blogged extensively about the epic legal tussles over the terms of their settlement. As more details emerged, Musk decided to publish his version of events on the Huffington Post. The lengthy piece, in which he wrote about his finances and his relationship with Talulah Riley, began with the words, "Given the choice, I'd rather stick a fork in my hand than write about my personal life."
Musk's desire for privacy is perhaps surprising in a man so driven and successful. "I hate writing about personal stuff," he says. "I don't have a Facebook page. I don't use my Twitter account. I am familiar with both, but I don't use them."
Outside work, where he spends up to 100 hours a week, Musk says he devotes nearly all his spare time to being a good dad. His children are the reason he gave up flying his military jet. "I have five kids and Iron Man does not have any kids," he says. "After having kids and running companies, I had so many responsibilities I decided it was not wise to take personal risks."
So are Musk and his entrepreneurial kin the future of space travel? As Nasa, the big daddy of the global space business, struggles with reduced budgets and a sceptical public, it seems perfectly possible. SpaceX is getting into orbit for a fraction of the cost of the space shuttle programme. It aims to make money as an ongoing business concern, rather than draining an ever-tightening public purse. It wants to drive the costs down and improve reliability and make space travel something that is open to everyone. Only private business, Musk thinks, can do that. "The fundamental barriers are improving reliability and reducing cost, and the government is not that good at either. Would you prefer to fly Virgin Atlantic or Soviet-era Aeroflot?"