SpaceX's valuation has grown exponentially since its 2002 founding. Gina Ferazzi / Los Angeles Times via Getty Images In 2002, Elon Musk founded a dark-horse company to make rockets reusable, and thus more affordable. That company, SpaceX, went public on Friday at a $1.8 trillion valuation, with shares popping out of the gate. BI pieced together some of SpaceX's most iconic — and visual — moments since its founding. Nearly 25 years ago, a mariachi band played at a SpaceX party while Elon Mu...