Elon Musk, CEO of SpaceX and Tesla, started the company in 2002 with the eventual mission of colonizing Mars. It's a lofty goal, and one that's hard to totally comprehend. But, as SpaceX continues to defy expectations, land reusable rockets and complete mission after improbable mission, the value of the company continues to rise. Right now, SpaceX is a private company. Unlike Musk's Tesla, which went public in 2010 and is now worth about $59.3 billion, SpaceX's value is hard to determine.
