Elon Musk and his firm, SpaceX, made history yesterday after sending a reusable Falcon 9 rocket into the air and then landing it vertically back on Earth.

But this self-styled " super villain " doesn't want to stop scrawling his name onto the annals of posterity just yet.

The billionaire has claimed that one of his future projects could involve building a city on Mars - an achievement which would make him one of the most famous humans of all time.

At a press conference held after the rocket landing, Musk discussed the possibility of putting settlers on the Red Planet.

"I think it really quite dramatically improves my confidence that a city on Mars is possible," he said.

"That's what all this is about."