Elon Musk is the world’s richest man and another of his companies will go public this month Sign up to our free money newsletter for investment analysis and expert advice to help you build wealth Sign up to our free money email for help building your wealth Sign up to our free money email for help building your wealth Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice SpaceX, Elon Musk ’s space exploration and artificial