SpaceX files to go public, and the math requires a little faith

# SpaceX Is Going Public With Sky-High Ambitions SpaceX just filed paperwork to become a publicly traded company, and the company is betting big on an enormous future—claiming a $28 trillion market opportunity that stretches well beyond its current rocket business. The filing reveals that part of executive pay is directly tied to actually building a Mars colony, which signals just how ambitious (and speculative) the company's long-term goals are. If successful, this IPO could rank among the largest in U.S. history, but investors will be betting heavily on SpaceX delivering on promises that are still largely in the experimental phase.