On Friday, Elon Musk’s image loomed large over Times Square from the giant TV screen of the Nasdaq stock exchange, as tourists outside snapped selfies, SpaceX investors in T-shirts grinned at their newfound fortunes and news cameras jostled for position. “If people had told me this was going to happen, I was like, ‘man you must be smoking some really good crack,’” Musk said in a video address celebrating SpaceX going public. "I gave SpaceX less than a 10% chance of succeeding at all."