Miguel J. Rodriguez Carrillo / AFP Investors say the SpaceX IPO could become a "watershed moment for the space industry." Those who made fortunes in SpaceX's IPO are expected to invest some of their windfall in the next generation. Here's Business Insider's list of 18 startups helmed by SpaceX employees-turned-founders. After eBay acquired PayPal in 2002, the PayPal mafia went on to reshape Silicon Valley. Now, after Musk's blockbuster SpaceX IPO, employees and investors who made fortunes a...