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NEW YORK: SpaceX’s blockbuster IPO filing included some out of this world details, including a provision that founder Elon Musk’s massive bonus only kicks in if one million humans settle on Mars.

The bonus structure, laid out in SpaceX’s prospectus filed with US regulators on Wednesday, reads less like a compensation agreement and more like a science fiction plot.

Musk’s bonus is contingent on SpaceX’s stock market value hitting targets ranging from $400 billion to $6 trillion — along with the company moving a million people to a planet 140 million miles (225 million kilometres) away.

Musk describes that ambition as essential to the long-term survival of the human race, though most experts see it as being at least decades away. Still, Musk will do just fine if the IPO goes ahead in the coming weeks as planned.