SpaceX lifts off in record Wall Street debut

Elon Musk's SpaceX began its first day as a public company on Wall Street Friday after the biggest initial public offering in history, with the polarizing entrepreneur promising he will take humanity to Mars.The company's financials are giving some on Wall Street pause, as the valuation largely depends on Musk delivering on promises worthy of science fiction, including putting data centers in space and humans on Mars using as-yet unproven technology.