Trading in shares of Elon Musk's rocket ship company SpaceX blasted off on Friday, marking the dramatic debut of the biggest initial public offering in history.

NEW YORK - The stock market debut of SpaceX -- Elon Musk's rocket, satellite and company -- expected Friday, could be the biggest in history. Here are the key numbers.

SpaceX is set to rank seventh among U.S.-listed companies when its shares commence trading on the Nasdaq on Friday

Founder, CEO, Chairman, and Chief Engineer of SpaceX, Elon Musk, speaks via videolink on the day of SpaceX's initial public offering (IPO) at the Nasdaq MarketSite in New York…