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.

SpaceX’s IPO filing, made public right after market close Wednesday, had something for everyone. For the Elon Musk fans, it revealed that the [CEO needs to colonize Mars](

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Space exploration is among the most exciting frontiers for humankind. Developing knowledge about our solar system, galaxy and the possibility of humans becoming an interplanetary species are alluring prospects in their scope and grandeur. But the specific ...

Elon Musk opting not to talk about his ambitious plans to colonize Mars, now that’s a first. The rocket billionaire was a no-show for a company discussion on establishing human settlements on the Red Planet, which was meant to take place on the same day ...

Add Yahoo as a preferred source to see more of our stories on Google. Elon Musk is putting his dreams of colonizing Mars on hold. But the moon, where even NASA aims to return astronauts as early as 2028, appears to have become a much more feasible target ...