Elon Musk is poised to become the first trillionaire. Just how much money is $1 trillion?

By Chris Isidore, CNN (CNN) — Elon Musk is poised to become the world’s first trillionaire. It’s a staggering amount of wealth never seen before in the history of human commerce. Musk already owns $273 billion in stock and options thanks to his role as Tesla CEO. But if the initial public offering of SpaceX—his