SpaceX made its debut at the Nasdaq on Friday, climbing more than 19% on its first day of trading and rising above a $2 trillion market valuation. But while the arrival of the company to public markets is squared away, some of its other long-term plans are years in the future. Elon Musk's company in its initial public offering prospectus with the Securities and Exchange Commission repeatedly focused on the "Moon, Mars and beyond." The company's goal for Mars is so large that Musk won't get a