Photo: Andrew Harnik//Getty Images Elon Musk ’s rocketship-AI company SpaceX is expected to go public on June 12, and when it does, the richest man in the world hopes investors will help him raise $75 billion, valuing the business at somewhere between $1.75 trillion and $2 trillion. If those numbers sound insane to you, consider this: With the debut of SpaceX on the NASDAQ, Musk — currently worth an estimated $811 billion — will very likely become the first trillionaire in history. (He also