Elon Musk has revealed plans for a stock market flotation of SpaceX that looks set to raise a record sum and could make him the world's first trillionaire. A prospectus for the upcoming initial public offering (IPO) says it is aimed at providing funding to put people on the moon and Mars as humans face existential threats that could wipe out civilisation. While the document did not state the exact amount SpaceX was looking to raise, such lofty ambitions do not come cheap.