SpaceX's IPO is finally here. Let's break down the key stats and storylines.

AP Photo/Eric GaySpaceX priced at $135 per share as expected yesterday afternoon.Today is the main event: when shares actually start trading.Here's your guide to the key stats and storylines defining SpaceX's record offering.I have to say … SpaceX's unorthodox decision to fix its IPO pricing ahead of time really sapped a lot of the usual fun out of the proceedings. But the offering is unlikely to stay predictable for long.SpaceX offered an unprecedented chunk of shares to retail investors