SpaceX has submitted a more than 250-page prospectus for what could be the largest initial public offering in history, a document that reveals spending on a scale greater than the economies of some countries and lays out founder Elon Musk’s vision of colonizing Mars to safeguard the human species. The IPO, expected to raise an estimated $75 billion, would rank as the largest ever and would likely make Musk — already the world’s richest person — the first trillionaire, according to the filing reviewed by the Associated Press.

MSI previously reported that the filing describes a one-million-person Mars colony and discloses restrictions on early investors. Inside SpaceX’s IPO filing

The prospectus reads at times like a script for a science fiction film, the AP reported. Musk details how he hopes to use his rockets to save humanity from extinction by making it an interplanetary species. He has set a goal of transporting 1 million people to Mars, an ambition that would require the enormous sums the IPO is designed to raise.

SpaceX’s spending currently operates at a level exceeding the economic output of some countries, the filing shows, and that pace is expected to accelerate as the company races to deliver on its promises of interplanetary travel. The $75 billion expected from the stock sale would finance those futuristic plans.

The offering would mark a transformative moment for capital markets. It is set to dwarf all previous IPOs and would channel a massive flow of public money into the most expensive private space program ever undertaken. The prospectus, filed with regulators, comes as SpaceX intensifies testing of its Starship rocket, the vehicle designed to carry crews to the Moon and Mars.